Name (i) two elements having valency 2 with respect to oxygen. (ii) two elements forming oxides of the types XO 3 . (iii) an element having number of electrons double in its L-shell than that present in its M-shell.

Question

Philoid · Accepted Answer

(i) Two elements that can show a valency of two with respect to oxygen are calcium and barium.

(ii) Two elements that can form oxides of type XO₃ are chromium (Cr) and sulphur (S). Formulae of their oxides are: CrO₃ and SO₃.

(iii) The innermost shell is k shell, followed by L shell and then comes the M shell. We can write an electronic configuration which can satisfy the given condition as: 2,8,4. We can see that the number of electrons present in L shell is double of the electrons present in M shell. This is possible for an element with atomic no.=14. Thus the element is Si.

Name(i) two elements having valency 2 with respect to oxygen.(ii) two elements forming oxides of the types XO3.(iii) an element having number of electrons double in its L-shell than that present in its M-shell.

Name
(i) two elements having valency 2 with respect to oxygen.

(ii) two elements forming oxides of the types XO₃.

(iii) an element having number of electrons double in its L-shell than that present in its M-shell.