<P> Every atom is composed of a nucleus and one or more electrons bound to the nucleus . The nucleus is made of one or more protons and typically a similar number of neutrons . Protons and neutrons are called nucleons . More than 99.94 % of an atom 's mass is in the nucleus . The protons have a positive electric charge , the electrons have a negative electric charge , and the neutrons have no electric charge . If the number of protons and electrons are equal , that atom is electrically neutral . If an atom has more or fewer electrons than protons , then it has an overall negative or positive charge , respectively , and it is called an ion . </P>
<P> Every atom is composed of a nucleus and one or more electrons bound to the nucleus . The nucleus is made of one or more protons and typically a similar number of neutrons . Protons and neutrons are called nucleons . More than 99.94 % of an atom 's mass is in the nucleus . The protons have a positive electric charge , the electrons have a negative electric charge , and the neutrons have no electric charge . If the number of protons and electrons are equal , that atom is electrically neutral . If an atom has more or fewer electrons than protons , then it has an overall negative or positive charge , respectively , and it is called an ion . </P>
where is the majority of the mass of an atom found
where is the majority of the mass of an atom found
in the nucleus
in the nucleus