periods and groups
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Hydrogen #1
period 1
Helium #2
period 1, group 18
Lithium #3
period 2, group 1
Boron #5
period 2, group 13
Carbon #6
period 2, group 14
Nitrogen #7
period 2, group 15
Oxygen #8
period 2, group 16
Fluorine #9
period 2, group 17
Neon #10
period 2, group 18
Beryllium #4
period 2, group 2
Argon #18
period 3, group 1
Sodium #11
period 3, group 1
Magnesium #12
period 3, group 13
Aluminum #13
period 3, group 14
Silicon #14
period 3, group 15
Phosphorous #15
period 3, group 16
Sulfur #16
period 3, group 17
Chlorine #17
period 3, group 18
Potassium #19
period 4, group 2
Calcium #20
period 4, group 3
