background

1766 Hydrogen 1817 Lithlum 1807 Sodium 1807 Potassium 1861 Rubidium 1860 R Caesium 1939 Fr Franclum 1798 3Beryllium 4756 Be 11 Magnesium 1 1808 19 Calcium 1787 37strontium 1772 55 Barium 1898 87 Radium Ra 12 1879 201Scandium 1794

1766 Hydrogen 1817 Lithlum 1807 Sodium 1807 Potassium 1861 Rubidium 1860 R Caesium 1939 Fr Franclum 1798 3Beryllium 4756 Be 11 Magnesium 1 1808 19 Calcium 1787 37strontium 1772 55 Barium 1898 87 Radium Ra 12 1879 201Scandium 1794

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