How many extra electrons do you think a hydrogen atom could hold? What properties would contribute to determining the number of electrons a hydrogen atom could hold?
The number of extra electrons that can hold by hydrogen atom is 1
The number of extra electrons that can hold by an atom depends on the valence electronic configuration of noble gas present in the period.
Elements having noble gas configuration are stable hence every atom try to get noble gas configuration
Thus for H, which is a first period element can get 1 extra electron to get Helium gas configuration
The elements present in second period can get 4,3,2,1 electrons to get Neon configuration (octet configuration)
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