|What is a positively charged particle in the nucleus of an atom?
|What is the region surrounding an atom's nucleus where one or more electrons are often found?
|What is a negatively charged particle that occupies the space in an atom outside the nucleus?
|What is one or more atoms of an element having the same number of protons, but a different number of neutrons?
|What is the region at the center of an atom that contains most of the mass of an atom?
|What is an atom that has a charge because it has gained or lost electrons?
|What is the number of protons in the nucleus of an atom of an element?
|What is the uncharged particle in the nucleus of an atom?