Why is hydrogen placed in both group 1 and 7
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For example, in HCl hydrogen loses its one electron to chlorine to be +1. In the halides, NaH hydrogen gains the one electron from sodium to be -1. In needed, all these charges can be calculated using Pauling's rule. It is thus logical to place hydrogen in both groups one and seven.
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Hydrogen is placed at the top of group 1 his atomic number is also 1
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