Practice Data Table: Atomic Structure
Symbol
# of neutrons
# of protons
# of electrons
Atomic #
Mass #
10
10
10
10
20
3Li
4
3
3
3
7
80
35Br
45
35
35
35
80
20Ca
20
20
20
20
40
137
56
81
56
56
56
137
121
80
80
80
201
18
17
17
17
35
20
10
7
40
Ne
Ba
201
80Hg
35
17
Cl