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In the Periodic Table of Mendeleev radium is in the second group (alkaline earth metals), period 7, atomic number 88; Ra ia a radioactive element, solid, rare in the nature.

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14y ago
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14y ago

Radon is a natural, radioactive chemical element, noble gases family, dangerous, practically non reactive.

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13y ago

Noble Gas

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Q: In what classification is radium?
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