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5,700 | DQ_011774 | inside the atom | How many electron clouds are depicted? | atomic_structure_8006.png | question_images/atomic_structure_8006.png | Diagram Multiple Choice | a. 1, b. 4, c. 3, d. 2 | a |
5,701 | DQ_011775 | inside the atom | What is used to describe where electrons are when they go around the nucleus of an atom? | atomic_structure_8006.png | question_images/atomic_structure_8006.png | Diagram Multiple Choice | a. Electron Cloud, b. Nucleus, c. Electron, d. Protons | a |
5,702 | DQ_011776 | inside the atom | What kind of charge does a Proton hold? | atomic_structure_8006.png | question_images/atomic_structure_8006.png | Diagram Multiple Choice | a. Negative, b. No Charge, c. Neutral, d. Positive | d |
5,703 | DQ_011777 | inside the atom | Which item would emit energy and spirally fall on the nucleus? | atomic_structure_8007.png | question_images/atomic_structure_8007.png | Diagram Multiple Choice | a. Neutron, b. Atom, c. Proton, d. Electron | d |
5,704 | DQ_011778 | inside the atom | What is the negative part of an atom? | atomic_structure_8007.png | question_images/atomic_structure_8007.png | Diagram Multiple Choice | a. Electron, b. Proton, c. Neutron, d. Croton | a |
5,705 | DQ_011779 | inside the atom | Which part of the atom contains most of the atom's mass? | atomic_structure_8007.png | question_images/atomic_structure_8007.png | Diagram Multiple Choice | a. Proton, b. Nucleus, c. Electron, d. Neutron | b |
5,706 | DQ_011780 | inside the atom | What particles can be found inside the nucleus? | atomic_structure_8007.png | question_images/atomic_structure_8007.png | Diagram Multiple Choice | a. Electrons and Protons, b. Protons and Neutrons, c. Electrons, d. Protons Only | b |
5,707 | DQ_011781 | inside the atom | How many elements are there in an atom? | atomic_structure_8007.png | question_images/atomic_structure_8007.png | Diagram Multiple Choice | a. 4, b. 3, c. 2, d. 5 | a |
5,708 | DQ_011782 | inside the atom | How many Neutrons are shown here? | atomic_structure_8007.png | question_images/atomic_structure_8007.png | Diagram Multiple Choice | a. 4, b. 2, c. 1, d. 3 | b |
5,709 | DQ_011783 | inside the atom | What is not contained in nucleus? | atomic_structure_8007.png | question_images/atomic_structure_8007.png | Diagram Multiple Choice | a. Proton, b. Neotron, c. Many protons, d. electron | d |
5,710 | DQ_011784 | inside the atom | Which of the following can be found inside of a Proton? | atomic_structure_8008.png | question_images/atomic_structure_8008.png | Diagram Multiple Choice | a. Quark, b. Nucleus, c. Electron, d. Neutron | a |
5,711 | DQ_011785 | inside the atom | Which particles are contained in the nucleus of an atom? | atomic_structure_8008.png | question_images/atomic_structure_8008.png | Diagram Multiple Choice | a. electron and neutron, b. neutron and proton, c. neutron only, d. proton and electron | b |
5,712 | DQ_011786 | inside the atom | How many electrons are represented? | atomic_structure_8008.png | question_images/atomic_structure_8008.png | Diagram Multiple Choice | a. 1, b. 3, c. 4, d. 2 | b |
5,713 | DQ_011787 | inside the atom | How many protons are in the diagram? | atomic_structure_8008.png | question_images/atomic_structure_8008.png | Diagram Multiple Choice | a. 6, b. 7, c. 8, d. 3 | d |
5,714 | DQ_011788 | inside the atom | How is the neutron electrically neutral? | atomic_structure_8008.png | question_images/atomic_structure_8008.png | Diagram Multiple Choice | a. it doesn't have positive charge, b. it has no charge at all, c. its negative and positive charges cancel out, d. it doesn't have a negative charge | c |
5,715 | DQ_011789 | inside the atom | How many electrons are in the atom below? | atomic_structure_8011.png | question_images/atomic_structure_8011.png | Diagram Multiple Choice | a. 9, b. 5, c. 8, d. 6 | c |
5,716 | DQ_011790 | inside the atom | Which part of the atom contains most of the atom's mass? | atomic_structure_8011.png | question_images/atomic_structure_8011.png | Diagram Multiple Choice | a. neutron, b. proton, c. nucleus, d. electron | c |
5,717 | DQ_011791 | inside the atom | What is the relationship between the number of protons and the number of electrons? | atomic_structure_8011.png | question_images/atomic_structure_8011.png | Diagram Multiple Choice | a. There is always one more proton than electron, b. There is the same number of them, c. There is no relation, d. There is always double the number of electrons than the number of protons | b |
5,718 | DQ_011792 | inside the atom | Which part of the atom is negatively charged? | atomic_structure_8011.png | question_images/atomic_structure_8011.png | Diagram Multiple Choice | a. Neutron, b. Electron, c. Nucleus, d. Proton | b |
5,719 | DQ_011793 | inside the atom | How many protons are shown in the diagram? | atomic_structure_8011.png | question_images/atomic_structure_8011.png | Diagram Multiple Choice | a. 3, b. 5, c. 4, d. 6 | d |
5,720 | DQ_011794 | inside the atom | Which of the following is not a part of an atom? | atomic_structure_8011.png | question_images/atomic_structure_8011.png | Diagram Multiple Choice | a. electrode, b. electron, c. proton, d. nucleus | a |
5,721 | DQ_011795 | inside the atom | Which particle has a positive electric charge? | atomic_structure_9016.png | question_images/atomic_structure_9016.png | Diagram Multiple Choice | a. Nucleus, b. Proton, c. Electron, d. Neutron | b |
5,722 | DQ_011796 | inside the atom | How many electrons are in the diagram? | atomic_structure_9016.png | question_images/atomic_structure_9016.png | Diagram Multiple Choice | a. 3, b. 4, c. 2, d. 1 | a |
5,723 | DQ_011797 | inside the atom | How many neutrons are present in nucleus? | atomic_structure_9016.png | question_images/atomic_structure_9016.png | Diagram Multiple Choice | a. 3, b. 2, c. 1, d. 4 | a |
5,724 | DQ_011798 | inside the atom | How many electrons are represented on the outer shell? | atomic_structure_9017.png | question_images/atomic_structure_9017.png | Diagram Multiple Choice | a. 6, b. 3, c. 4, d. 2 | c |
5,725 | DQ_011799 | inside the atom | How many electrons orbit the nucleus? | atomic_structure_9017.png | question_images/atomic_structure_9017.png | Diagram Multiple Choice | a. 7, b. 4, c. 5, d. 6 | d |
5,726 | DQ_011800 | inside the atom | What is the charge of the electron in reference to the proton? | atomic_structure_9017.png | question_images/atomic_structure_9017.png | Diagram Multiple Choice | a. more negative, b. more positive, c. Atoms have the same number of electrons as protons, d. they are the same | c |
5,727 | DQ_011801 | inside the atom | What particles are surrounding the proton? | atomic_structure_9019.png | question_images/atomic_structure_9019.png | Diagram Multiple Choice | a. neutron, b. atom, c. valence electron, d. nucleus | c |
5,728 | DQ_011802 | inside the atom | How many valence electrons are present in the atom? | atomic_structure_9019.png | question_images/atomic_structure_9019.png | Diagram Multiple Choice | a. 4, b. 3, c. 2, d. 1 | a |
5,729 | DQ_011803 | inside the atom | Silicon as how many valence electrons? | atomic_structure_9019.png | question_images/atomic_structure_9019.png | Diagram Multiple Choice | a. 6, b. 4, c. 8, d. 2 | b |
5,730 | DQ_011804 | inside the atom | Identify the most condensed part of an atom | atomic_structure_9021.png | question_images/atomic_structure_9021.png | Diagram Multiple Choice | a. Nucleus, b. Nucleolus, c. Shell K, d. Photons | a |
5,731 | DQ_011805 | inside the atom | Which of the particles gives unique properties to elements? | atomic_structure_9021.png | question_images/atomic_structure_9021.png | Diagram Multiple Choice | a. proton, b. neutron, c. electron, d. nucleus | a |
5,732 | DQ_011806 | inside the atom | Where are electrons located? | atomic_structure_9021.png | question_images/atomic_structure_9021.png | Diagram Multiple Choice | a. Inside the nucleus, b. Next to the neutrons, c. Inside and outside the nucleus, d. Outside the nucleus | d |
5,733 | DQ_011807 | inside the atom | How many electrons are in this diagram? | atomic_structure_9021.png | question_images/atomic_structure_9021.png | Diagram Multiple Choice | a. 13, b. 12, c. 11, d. 8 | a |
5,734 | DQ_011808 | inside the atom | How many protons are shown in the diagram? | atomic_structure_9021.png | question_images/atomic_structure_9021.png | Diagram Multiple Choice | a. 6, b. 7, c. 2, d. 4 | b |
5,735 | DQ_011809 | inside the atom | What is the nucleous made of? | atomic_structure_9021.png | question_images/atomic_structure_9021.png | Diagram Multiple Choice | a. Electrons and Neutrons, b. Protons and Neutrons, c. Protons and Electrons, d. Electrons Only | b |
5,736 | DQ_011810 | inside the atom | What is the center of an atom called? | atomic_structure_9022.png | question_images/atomic_structure_9022.png | Diagram Multiple Choice | a. Nucleus, b. Neutron, c. Proton, d. Electron | a |
5,737 | DQ_011811 | inside the atom | Which particles can be found in the nucleus? | atomic_structure_9022.png | question_images/atomic_structure_9022.png | Diagram Multiple Choice | a. Protons and neutrons, b. Electrons and Neutrons, c. Electrons and protones, d. Neutrons only | a |
5,738 | DQ_011812 | inside the atom | What attracts the electron to the nucleus? | atomic_structure_9022.png | question_images/atomic_structure_9022.png | Diagram Multiple Choice | a. Neutron, b. Electron, c. Nucleus, d. Proton | d |
5,739 | DQ_011813 | inside the atom | How many electrons are in the image? | atomic_structure_9022.png | question_images/atomic_structure_9022.png | Diagram Multiple Choice | a. 1, b. 3, c. 2, d. 8 | b |
5,740 | DQ_011814 | inside the atom | How many parts are there in an atom? | atomic_structure_9022.png | question_images/atomic_structure_9022.png | Diagram Multiple Choice | a. 2, b. 5, c. 3, d. 4 | d |
5,741 | DQ_011815 | inside the atom | Atoms of each type of element have a characteristic number of what particle? | atomic_structure_9023.png | question_images/atomic_structure_9023.png | Diagram Multiple Choice | a. electrons, b. neutrons, c. protons, d. nucleus | c |
5,742 | DQ_011816 | inside the atom | How many electrons are in the diagram? | atomic_structure_9023.png | question_images/atomic_structure_9023.png | Diagram Multiple Choice | a. 6, b. 7, c. 12, d. 5 | a |
5,743 | DQ_011817 | inside the atom | How many protons are there in a carbon atom? | atomic_structure_9023.png | question_images/atomic_structure_9023.png | Diagram Multiple Choice | a. 12, b. 7, c. 5, d. 6 | d |
5,744 | DQ_011818 | inside the atom | Can a carbon atom still be formed if 2 protons and 2 neutrons are removed? | atomic_structure_9023.png | question_images/atomic_structure_9023.png | Diagram Multiple Choice | a. Yes, b. No, c. Cannot determine from the given information, d. Maybe | b |
5,745 | DQ_011819 | inside the atom | Identify the atomic number of Hydrogen | isotopes_7061.png | question_images/isotopes_7061.png | Diagram Multiple Choice | a. 3, b. 1, c. 2, d. 4 | b |
5,746 | DQ_011820 | inside the atom | The amount of which particle determines if an atom is an isotope? | isotopes_7061.png | question_images/isotopes_7061.png | Diagram Multiple Choice | a. Proton, b. Electron, c. Neutron, d. Hydrogen | c |
5,747 | DQ_011821 | inside the atom | What did we add to protium for it to become deuterium? | isotopes_7061.png | question_images/isotopes_7061.png | Diagram Multiple Choice | a. A proton, b. Atomic number, c. A neutron, d. An electron | c |
5,748 | DQ_011822 | inside the atom | What does the plus (+) symbol signify? | isotopes_7061.png | question_images/isotopes_7061.png | Diagram Multiple Choice | a. Protons, b. Neutrons, c. Nucleus, d. Electrons | a |
5,749 | DQ_011823 | inside the atom | How many neutrons raise the atomic weight by 2? | isotopes_8096.png | question_images/isotopes_8096.png | Diagram Multiple Choice | a. 2, b. 4, c. 1, d. 5 | a |
5,750 | DQ_011824 | inside the atom | What is the atomic weight of all the isotopes depicted in the diagram added together? A) 38; B) 39; C) 40; D) 41 | isotopes_8096.png | question_images/isotopes_8096.png | Diagram Multiple Choice | a. 40, b. 38, c. 41, d. 39 | d |
5,751 | DQ_011825 | inside the atom | What would be the atomic weight of a carbon 15 atoms? | isotopes_8096.png | question_images/isotopes_8096.png | Diagram Multiple Choice | a. 22, b. 11, c. 14, d. 15 | d |
5,752 | DQ_011826 | inside the atom | Which has 2 extra neutrons? | isotopes_8097.png | question_images/isotopes_8097.png | Diagram Multiple Choice | a. Unstable Carbon Atom, b. Stable Carbon Atom, c. Unstable- Radioactive Carbon Isotope, d. Stable Carbon Isotope | c |
5,753 | DQ_011827 | inside the atom | What do the two extra neutrons do to the carbon atom? | isotopes_8097.png | question_images/isotopes_8097.png | Diagram Multiple Choice | a. They cause the number of electrons to increase, b. They make it unstable, c. There are no two extra neutrons, d. They do not affect it | b |
5,754 | DQ_011828 | inside the atom | Which carbon isotope has an extra neutron? | isotopes_8097.png | question_images/isotopes_8097.png | Diagram Multiple Choice | a. stable carbon isotope, b. unstable carbon isotope, c. unstable carbon atom, d. stable carbon atom | a |
5,755 | DQ_011829 | inside the atom | From the diagram, how many carbon isotopes are there? | isotopes_8097.png | question_images/isotopes_8097.png | Diagram Multiple Choice | a. 2, b. 1, c. 3, d. 0 | a |
5,756 | DQ_011830 | inside the atom | How many extra neurons does the unstable carbon isotope have? | isotopes_8097.png | question_images/isotopes_8097.png | Diagram Multiple Choice | a. 2, b. 3, c. 4, d. 1 | a |
5,757 | DQ_011831 | inside the atom | What do you call a subatomic particle with a symbol p or p+? | isotopes_8097.png | question_images/isotopes_8097.png | Diagram Multiple Choice | a. Electron, b. Proton, c. Neutron, d. Carbon | b |
5,758 | DQ_011832 | inside the atom | What makes the oxygen stable? | isotopes_8098.png | question_images/isotopes_8098.png | Diagram Multiple Choice | a. proton, b. neutron, c. valence shell electron, d. energy configuration | d |
5,759 | DQ_011833 | inside the atom | How many protons do the two atoms have in total? | isotopes_8098.png | question_images/isotopes_8098.png | Diagram Multiple Choice | a. 10, b. 16, c. 18, d. 8 | b |
5,760 | DQ_011834 | inside the atom | Oxygen 16 and 18 are called what? | isotopes_8098.png | question_images/isotopes_8098.png | Diagram Multiple Choice | a. Isotopes, b. Protons, c. Ions, d. Neutrons | a |
5,761 | DQ_011835 | inside the atom | Oxygen-16 has how many protons? | isotopes_8098.png | question_images/isotopes_8098.png | Diagram Multiple Choice | a. 12, b. 6, c. 8, d. 10 | c |
5,762 | DQ_011836 | inside the atom | Deuterium has how many electrons? | isotopes_8099.png | question_images/isotopes_8099.png | Diagram Multiple Choice | a. 4, b. 2, c. 1, d. 3 | c |
5,763 | DQ_011837 | inside the atom | How many electrons are there in Deuterium? | isotopes_8099.png | question_images/isotopes_8099.png | Diagram Multiple Choice | a. 1, b. 2, c. 3, d. 4 | a |
5,764 | DQ_011838 | inside the atom | Identify which has eight neutrons. | isotopes_9123.png | question_images/isotopes_9123.png | Diagram Multiple Choice | a. Carbon-13, b. Carbon-14, c. Carbon-15, d. Carbon-12 | b |
5,765 | DQ_011839 | inside the atom | What falls between carbon-12 and carbon-14? | isotopes_9123.png | question_images/isotopes_9123.png | Diagram Multiple Choice | a. carbon-13, b. carbon-11, c. carbon-15, d. carbon-10 | a |
5,766 | DQ_011840 | inside the atom | What's the difference between carbon-12 and carbon-13? | isotopes_9123.png | question_images/isotopes_9123.png | Diagram Multiple Choice | a. One has one more neutron, b. None, c. One has one more proton than the other, d. One has two more protons | c |
5,767 | DQ_011841 | inside the atom | How many neutrons are found in Carbon-14? | isotopes_9123.png | question_images/isotopes_9123.png | Diagram Multiple Choice | a. 14, b. 8, c. 7, d. 6 | b |
5,768 | DQ_011842 | inside the atom | How many protons does carbon-12 contain? | isotopes_9123.png | question_images/isotopes_9123.png | Diagram Multiple Choice | a. 5, b. 6, c. 8, d. 7 | b |
5,769 | DQ_011843 | inside the atom | The following forms of Carbon are called what? | isotopes_9123.png | question_images/isotopes_9123.png | Diagram Multiple Choice | a. Chiral molecules, b. Ions, c. Isomers, d. Isotopes | d |
5,770 | DQ_011844 | inside the atom | How many neutrons does Tritium have? | isotopes_9124.png | question_images/isotopes_9124.png | Diagram Multiple Choice | a. 3, b. 2, c. 1, d. 4 | a |
5,771 | DQ_011845 | inside the atom | Adding the number of protons and neutrons will result to: | isotopes_9124.png | question_images/isotopes_9124.png | Diagram Multiple Choice | a. Mass Number, b. Number of ions, c. Atomic Number, d. Number of electrons | a |
5,772 | DQ_011846 | inside the atom | Which is radioactive? | isotopes_9125.png | question_images/isotopes_9125.png | Diagram Multiple Choice | a. Carbon-13, b. Stable, c. Carbon-12, d. Carbon-14 | d |
5,773 | DQ_011847 | inside the atom | Based on the stable carbon 12 how does the neutron change when it becomes radioactive? | isotopes_9125.png | question_images/isotopes_9125.png | Diagram Multiple Choice | a. decreases, b. doubles, c. stays the same, d. increases by 2 | d |
5,774 | DQ_011848 | inside the atom | How many protons are in carbon-13? | isotopes_9125.png | question_images/isotopes_9125.png | Diagram Multiple Choice | a. 2, b. 5, c. 6, d. 8 | c |
5,775 | DQ_011849 | inside the atom | How many electrons are in all three of the atoms pictured? | isotopes_9125.png | question_images/isotopes_9125.png | Diagram Multiple Choice | a. 13, b. 6, c. 14, d. 12 | b |
5,776 | DQ_011850 | inside the atom | How many neutrons are in an unstable carbon atom? | isotopes_9125.png | question_images/isotopes_9125.png | Diagram Multiple Choice | a. 7, b. 14, c. 8, d. 6 | c |
5,777 | DQ_011851 | inside the atom | How many neutrons does carbon-13 have? | isotopes_9125.png | question_images/isotopes_9125.png | Diagram Multiple Choice | a. 7, b. 6, c. 9, d. 8 | a |
5,778 | DQ_011852 | inside the atom | How many molecules are? | isotopes_9126.png | question_images/isotopes_9126.png | Diagram Multiple Choice | a. 6, b. 4, c. 2, d. 3 | c |
5,779 | DQ_011853 | inside the atom | How many neutrons are there in carbon-13? | isotopes_9126.png | question_images/isotopes_9126.png | Diagram Multiple Choice | a. 8, b. 5, c. 7, d. 6 | c |
5,780 | DQ_011854 | inside the atom | How many neutrons does carbon-13 have? | isotopes_9126.png | question_images/isotopes_9126.png | Diagram Multiple Choice | a. 8, b. 6, c. 9, d. 7 | d |
5,781 | DQ_011855 | inside the atom | What does the green circle represent? | isotopes_9126.png | question_images/isotopes_9126.png | Diagram Multiple Choice | a. Carbon, b. Atom, c. Neutron, d. Proton | d |
5,782 | DQ_011856 | inside the atom | What does hydrogen become if one adds two neutrons to it? | isotopes_9128.png | question_images/isotopes_9128.png | Diagram Multiple Choice | a. leuterium, b. quaternion, c. deuterium, d. tritium | d |
5,783 | DQ_011857 | inside the atom | How many neutrons does hydrogen have? | isotopes_9128.png | question_images/isotopes_9128.png | Diagram Multiple Choice | a. 1, b. 2, c. zero, d. 3 | c |
5,784 | DQ_011858 | inside the atom | Which of these 3 atoms would be the heaviest? | isotopes_9128.png | question_images/isotopes_9128.png | Diagram Multiple Choice | a. Tritium, b. Deuterium, c. Data Insufficient?, d. Hydrogen | a |
5,785 | DQ_011859 | inside the atom | How many neutrons does the 18O Isotope have? | isotopes_9129.png | question_images/isotopes_9129.png | Diagram Multiple Choice | a. 10, b. 9, c. 2, d. 6 | a |
5,786 | DQ_011860 | inside the atom | How many protons do the oxygen isotopes in the diagram have? | isotopes_9129.png | question_images/isotopes_9129.png | Diagram Multiple Choice | a. 16, b. 9, c. 10, d. 8 | d |
5,787 | DQ_011861 | inside the atom | What is the atomic mass of Al? | atomic_mass_number_9008.png | question_images/atomic_mass_number_9008.png | Diagram Multiple Choice | a. 27, b. 13, c. 30, d. 33 | a |
5,788 | DQ_011862 | inside the atom | What is the atomic number of the protium? | atomic_mass_number_9005.png | question_images/atomic_mass_number_9005.png | Diagram Multiple Choice | a. 1, b. 3, c. 4, d. 2 | a |
5,789 | DQ_011863 | inside the atom | Which has the higher N | isotopes_9129.png | question_images/isotopes_9129.png | Diagram Multiple Choice | a. 16o, b. 8P, c. 18o, d. 14o | c |
5,790 | DQ_011864 | how elements are organized | How many groups are there in the periodic table of elements? | periodic_table_7352.png | question_images/periodic_table_7352.png | Diagram Multiple Choice | a. 17, b. 18, c. 15, d. 16 | b |
5,791 | DQ_011865 | how elements are organized | The noble gases are members of which group of the periodic table? | periodic_table_7352.png | question_images/periodic_table_7352.png | Diagram Multiple Choice | a. Group 2, b. Group 1, c. Group 17, d. Group 18 | b |
5,792 | DQ_011866 | how elements are organized | What element comes between Pb and Po? | periodic_table_7352.png | question_images/periodic_table_7352.png | Diagram Multiple Choice | a. Bi, b. Sb, c. Sn, d. Te | a |
5,793 | DQ_011867 | how elements are organized | How many Boxes are in Group 1-1? | periodic_table_7352.png | question_images/periodic_table_7352.png | Diagram Multiple Choice | a. 7, b. 3, c. 10, d. 8 | a |
5,794 | DQ_011868 | how elements are organized | How many lanthanides are there in the periodic table? | periodic_table_7352.png | question_images/periodic_table_7352.png | Diagram Multiple Choice | a. 15, b. 12, c. 14, d. 16 | a |
5,795 | DQ_011869 | how elements are organized | Which letter(s) represent the element copper? | periodic_table_7356.png | question_images/periodic_table_7356.png | Diagram Multiple Choice | a. Cu, b. Cr, c. Co, d. Au | a |
5,796 | DQ_011870 | how elements are organized | What is Helium? | periodic_table_7356.png | question_images/periodic_table_7356.png | Diagram Multiple Choice | a. liquid, b. metal, c. solid, d. Nonmetal | b |
5,797 | DQ_011871 | how elements are organized | What element comes before the start of lanthanide series of elements? | periodic_table_7356.png | question_images/periodic_table_7356.png | Diagram Multiple Choice | a. Carbon, b. Ferrum, c. Aluminium, d. Barium | d |
5,798 | DQ_011872 | how elements are organized | How many nonmetals are there in the periodic table? | periodic_table_7356.png | question_images/periodic_table_7356.png | Diagram Multiple Choice | a. 21, b. 15, c. 54, d. 2 | a |
5,799 | DQ_011873 | how elements are organized | What element corresponds for liquid metal? | periodic_table_7356.png | question_images/periodic_table_7356.png | Diagram Multiple Choice | a. Hg, b. H, c. Nb, d. Mg | a |
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