Show:
GROUP A
GROUP B
GROUP C
GROUP D
GROUP E
1

O

Oxygen

1
N

Nitrogen

1

C

Carbon

1

H

Hydrogen

1
U

Uranium

2

He

Helium

2

Ne

Neon

2

Be

Beryllium

2

Al

Aluminum

2

Zn

Zinc

3

Cl

Chlorine

3

Mg

Magnesium

3

Mn

Manganese

3

Li

Lithium

3

Co

Cobalt

4

Ca

Calcium

4

Kr

Krypton

4

Ar

Argon

4

Pt

Platinum

4

Ni

Nickel

5

Na

Sodium

5

Fe

Iron

5

Au

Gold

5

Ag

Silver

5

Sn

Tin