the majority of the mass of an atom is found in protons and neutrons.
where is the majority of the mass of an atom found?
protons and neutrons
the number of protons within the atom's nucleus is called atomic number and is equal to the number of electrons in the neutral (non-ionized) atom. each atomic number identifies a specific element, but not the isotope; an atom of a given element may have a wide range in its number of neutrons. the number of nucleons (both protons and neutrons) in the nucleus is the atom's mass number, and each isotope of a given element has a different mass number.
isotope
mister atom was created by dr. charles langley in a story in "captain marvel adventures" #78. his body was constructed first, and then langley charged the robot with radioactive energy. the spark that gave the robot life also ended the life of his creator. super-charged with a nuclear reactor and armed with a deadly mind, mister atom went on a wave of destruction believing he should rule the world and killed several people in washington, before being challenged to a fight to the finish by captain marvel as he tried to attack the un building. he was stopped (barely) by captain marvel. mr. atom was imprisoned in an underground, lead-lined cell, as no other prison could contain his power, but he threatens to break out one day. later he was freed by aliens called the comet men who hoped to employ his power in the conquest of earth, though they told him he would rule earth, and told him to destroy fawcett city to show his power. but they fell to fighting among themselves when mr atom realized they planned to destroy him and they were all apparently destroyed in a giant explosion. however, the blast had actually thrown mr. atom forward in time, to 2053, a world where almost everything was run by atomic power, which mr atom found out from an inhabitant, and he decided it would be the perfect conquest for him. captain marvel travelled to this future after being told by shazam of the danger which threatened it and battled atom again, who forced marvel off by threatening to cause the destruction of the world using the machinery. by now the world officials had decided to give in to mr atom and sent a delegation. but once again he was apparently destroyed, this time in an atomic furnace when the engines were turned on after marvel disguised himself as part of the delegation to block mister atom from the machinery.
mister atom