an atom of element X has 17 protons in its nucleus what will be the number of electrons in its various energy shells right its electric configuration
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An atom of an element (X) has its K, L and M shells filled with some electrons. It reacts with sodium metal to from a compound NaX. The number of electrons in the M shell of the atom (X) will be Seven.
In NaX, Na forms Na+ and X forms negtive ions. Thus, X gains one electron to form uni negative ion in which octet will be completed. Hence, X has 7 valence electrons.
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electronic configaration will be 2,8,7
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