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In which year Beryllium was discovered?
In which year Calcium was discovered?
In which year Hydrogen was discovered?
In which year Lithium was discovered?
In which year Magnesium was discovered?
In which year Potassium was discovered?
In which year Rubidium was discovered?
In which year Scandium was discovered?
In which year Sodium was discovered?
In which year Strontium was discovered?