Question

‘All alkali metals including hydrogen have valency 1. Hydrogen and halogens have valency 1.’ Explain the above statements in terms of electronic configuration.


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Answer 1

Answer:

Valency is the number of electron required for an element to be stable or to achieve nearest noble gas configuration.

Hydrogen has valency 1 as it need 1 electron to achieve its nearest noble that is helium and halogens are the elements in group 17 i.e. they have 7 elements in their last shell so they need only 1 electron to achieve the next noble gas configuration.

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