1.

Give scientific reasons :Elements in the same group show same valency.

Answer»

i. The number of electrons in the outermost shell of an atom is its valence electrons. Valency is determined by the number of valence electrons present in the outermost shell of an atom. 

ii. The number of valence electrons for all the elements in a group is the same. 

So, elements in the same group show same valency.



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