Question

A) Arrange the following elements in the increasing order of their atomic radius.
Boron, Oxygen, Nitrogen, Carbon and Beryllium.
B) Two elements X and Y have a tendency to lose electrons. With chlorine and oxygen these
elements will form XCl, X2O, YCl2 and YO compounds.
i) Identify the groups of X and Y.
ii) If both X and Y belong to same period, then which element will have greater effective
nuclear charge.

Answer 1

answer A.oxygen, nitrogen,carbon, boron, beryllium.

answer B.

Answer 2

Oxygen, nitrogen, carbon, boron, berilliyium 

Explanation:

(A) The correct order of increasing tendency of atomic radius as follows: Oxygen, nitrogen, carbon, boron, beryllium.

(B) In XCI, X20, YCI2

(i) X element belongs to 1 group of modern periodic table while Y element belongs to 2 group of modern periodic table.

(ii) Y element have more effective nuclear charge due to its small atomic radius than X element.