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Which highly reactive gas was probably absent from the earth's primitive atmosphere?
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An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have
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Astudent is asked to identify and element that is pale yellow brittle solid and does not conduct electricity. at which location in this periodic table would the element most likely be found?
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Which highly reactive gas was probably absent from the earth's primitive atmosphere?...
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