3. How many electrons, protons and neutrons will be there in the given element aX, also calculate the
valency
give the correct ans plx that's a numerical question
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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
Explanation:
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