If K , Land M shells of an element X are completely filled, then element X will be
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1
Explanation:
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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Answer:
Argon
Explanation:
atomic no. of argon is 18
2,8,8
k,l,m
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