Hydrogen
Group 1
Period 1
Helium
Group 18
Period 1
Lithium
Group 1
Period 2
Beryllium
Group 2
Period 2
Boron
Group 13
Period 2
Carbon
Group 14
Period 2
Nitrogen
Group 15
Period 2
Oxygen
Group 16
Period 2
Fluorine
Group 17
Period 2
Neon
Group 18
Period 2
Sodium
Group 1
Period 3
Magnesium
Group 2
Period 3
Aluminum
Group 13
Period 3
Silicon
Group 14
Period 3
Phosphorus
Group 15
Period 3
Sulfur
Group 16
Period 3
Chlorine
Group 17
Period 3
Argon
Group 18
Period 3
Potassium
Group 1
Period 4
Calcium
Group 2
Period 4
Scandium
Group 3
Period 4
Zinc
Group 12
Period 4
Bromine
Group 17
Period 4
Krypton
Group 18
Period 4
Rubidium
Group 1
Period 5
Strontium
Group 2
Period 5
Silver
Group 11
Period 5
Cadmium
Group 12
Period 5
Iodine
Group 17
Period 5
Xenon
Group 18
Period 5
Cesium
Group 1
Period 6
Barium
Group 2
Period 6