Account for the following: (i) Mg^+2 ion is smaller than O^-2 ion although both have same electronic structure,

Question

(a) Account for the following: 

(i) Mg⁺² ion is smaller than O^-2 ion although both have same electronic structure, 

(ii) Ionisation enthalpy of nitrogen is more than that of oxygen, 

(b) Write the IUPAC name and the symbol for the element with at. no. 118.

Answer 1

(a) (i) It is due to greater nuclear charge and greater effective nuclear charge in Mg²⁺ and O^2-. 

(ii) It is due to stability of electronic configuration of nitrogen.

(b) Uuo (Ununoctium).