Question

The ionization enthalpies, $(IE{)}_1$ and the $(IE{)}_2$ in kJ mol${}^{-1}$ of a few elements designated by Roman numerals are shown below :

Element	$(IE{)}_1$	$(IE{)}_2$
A	2372	5251
B	520	7300
C	900	1760
D	1680	3380

Which of the above elements form a stable binary halide of the formula $M{X}_2$?

• A. $A$
• B. $B$
• C. $C$
• D. $D$

Answer 1

The correct option is C $C$

From the table, we can conclude that $C$ has a low value of first as well as second ionization potential.

So, it may have the tendency to lose two electrons and form the +2 oxidation state.

Therefore, it will form a stable binary halide of the formula $M{X}_2$.