How is the valency of an atom related to its electronic configuration?
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The valency of an atom refers to the number of electrons within it's outer (valence) shell. The number of valence electrons will determine the last number of the atom's electron configuration. For example: Calcium has an electron configuration of 2,8,8,2 simply put, and has 2 valence electrons. The valency on atom also determines the reactivity and chemical properties of the particular element
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because in electronic confrigation if all the shells are filled with the quantity they required this elements are known as noble gas but if in any element the shell required the quanity of no. its valency is decide by it....
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