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English, 06.08.2019 06:10 miranda911

Why is hydrogen (h) placed with the elements in group 1a? a it has a very low atomic mass. b it is a very reactive gas. c it has the same number of valence electrons. d they have the same chemical properties.

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Why is hydrogen (h) placed with the elements in group 1a? a it has a very low atomic mass. b it is...
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