Find out the atomic number of an element having
3 shells K, L and M in which M shell has 4 electrons. Identify the element.
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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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Sorry bro I don't know the answer. If it's righot then the answer is "Lithium"
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