1.
positively charged subatomic particle located in the nucleus
2.
massive, positively charged CENTER of an atom made up of protons and neutrons
3.
the smallest quantity of an element that can take part in a chemical reaction
4.
negatively charged, subatomic particle of relatively low mass located outside the nucleus
5.
uncharged, subatomic particle located in the nucleus
6.
sum of the numbers of neutrons and protons in the nucleus of an atom
7.
unit of mass equal to 1⁄12 of the mass of a 12C atom
8.
number of protons in the nucleus of an atom
9.
average mass of atoms of an element, expressed in amu
10.
atoms that contain the same number of protons but different numbers of neutrons
11.
a mathematical region around the nucleus of an atom that describes an electron's probable location
12.
the lowest energy state of an atom or other particle.
13.
a region of an atom in which electrons of the same energy are likely to be found
14.
when an atom absorbs energy, its electrons move to a higher energy level
