1
Negatively charged subatomic particle
2
Two atoms of the same element with different masses are
4
The mass number is the sum of protons and _______
5
Ions with positive charge are known as
6
Element with 3 protons
7
Subatomic particle that provides the identity of the atom
8
Ions with negative charge are known as
9
Usual number of electrons per energy level (except level 1)
10
Smallest unit of matter
