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- · Period Lithium 23 Na Sodium 11 Potassium Rubidium 37 Caesium 223 Francium 87 Beryllium 24 Mg...
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· Period Lithium 23 Na Sodium 11 Potassium Rubidium 37 Caesium 223 Francium 87 Beryllium 24 Mg Magnesium 12 Calcium Strontium Barium 226 Radium
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