An element ‘X’ with electronic configuration (2, 8, 2) combines separately with two radicals, (NO 3 ) – and (SO 4 ) 2–.

(i) Is ‘X’ a metal or a non-metal? Write the nature of its oxide.

(ii) Write the formula of the compounds of ’X’ formed by the combination of these radicals. Are these compounds covalent or electrovalent?



Electronic configuration of X=2,8,2


Metals lose electrons to become stable(ie., attain noble gas configuration) whereas, non-metals gain electrons to become stable. Metals form basic oxides and non-metals form acidic oxides.

Since X has a tendency to donate 2 electrons in order to become stable, it is a metal. Since X is a metal, the nature of its oxide will be basic.


X will react with 2 NO 3 - radicals because it has 2 electrons for donation to form X(NO 3 ) 2

Reaction of X with NO3 - Teachoo.jpg

X will react with one SO 4 2- to form XSO 4

Reaction of X with SO4 - Teachoo.jpg

These compounds are ionic or electrovalent.

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CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo