Use your periodic table to complete the table below. The first one has been done for you. Element
Atomic #
Mass
Protons
Neutrons
Electrons
Symbol
Iodine
53
127
53
74
54
I1-

35
17

Cl1-
Hydrogen

1
1

0

35

45
36

5
11

B3+
Oxygen

16
8

10

Element
Atomic #
Mass
Protons
Neutrons
Electrons
Symbol
Nitrogen

7
7
10

Aluminum

27

10

56
26

24

29

35

Cu1+

64
29

27

Match each of the positive ions listed with the total number of electrons that ion contains. Use your periodic table. The same answer may be used more than once.

A) 2 B) 10 C) 21 D) 23 E) 24
F) 25 G) 36 H) 48 I) 76 J) 81

Al+3 Fe+3 Mg+2 Sn+2
Li+1 Cr+3 Rb+1 Pt+2