Q1. (a) A divalent element E has 4 electronic shells in its atom. If E forms a cation, what is the electronic configuration of E? Also, name the inert gas which has the same electronic configuration as the cation of E.
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(a)The atomic number of element with electronic configuration 2,8,7=17.
(b)It has 7 valence electrons, therefore it would be chemically similar to F(9)=2,7.
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