Question

where do from the valancy came​

Answer 1

Answer:

the last orbit or the balance orbit

Explanation:

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Answer 2

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The valency of an element can be said in 2 ways depending on its outer-most electron shell. First of all, the number of valence electrons (number of electrons in the outer-most shell) can be determined by either looking at the group (column number) in which the element is situated in the Periodic Table.

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