1
Q
Nucleus
A
The center of an atom, containing the protons and neutrons
2
Q
Atomic Number
A
The number of protons in an atom
3
Q
Mass Number
A
The sum of the number of neutrons and protons in the nucleus of an atom
4
Q
Isotopes
A
Two or more atoms that have the same number of protons but different numbers of neutrons
5
Q
Element
A
A collections of atoms that all have the same number of protons
6
Q
Radioactive Isotope
A
An atom whose nucleus is not stable
Apologia Physical Science
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