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H
Hydrogen; 1
Li
Lithium; 1
Na
Sodium; 1
K
Potassium; 1
Rb
Rubidium; 1
Cs
Cesium; 1
Fr
Francium; 1
Be
Beryllium; 2
Mg
Magnesium; 2
Ca
Calcium; 2
Sr
Strontium; 2
Ba
Barium; 2
Ra
Radium; 2