The group number of (a) is VA(15) and electronic configuration is 1s2 2s2 2p3 . the group number of (b) is IVA(14) and the electronic configuration is 1s2 2s2 2p2 .
What is electronic configuration ?
it shows the distribution of electrons in the atomic orbitals .
it follows a standard notation of s, p, d, f atomic orbitals in which electronic distribution of an atom occurs .
it has standard notation method as well as condensed electron configuration .
it is useful in determining the valency of an element .
it is useful in predicting the properties of a group of elements .
It contains the symbol of the nearest , smaller noble gas in the square brackets and then the symbols of the occupied orbitals which contains valance electrons .
Example of condensed electron configuration is given by ,
in case of iron the electronic configuration is 1s2 2s2 2p6 3s2 4s2 3d6 .
Thus , the condensed electron configuration of iron is [Ar] 3d6 4s2 .
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