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Elements, which are gasous or form volatile hydrides in combination with hydrogen. |
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These elements form saline hydrides in combination with with hydrogen. Their enrichment in the Earth Crust has a factor from 3 (Na) to 280 (Th). |
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Elements, which are reduceable to metals by hydrogen. Their deviation from the cosmic abundance correlate with the ionization potential. |
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These elements form with stable, high melting carbides in combination with carbon. |
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Lead and bismuth are final products of the radioactive decay. |