Question

Elements $A,B$ and $C$ have respectively $1,3$ and $5$ electrons in valence shell. Ionic compound is not formed from :

• A. $A$ and $C$
• B. $A$ and $B$
• C. $B$ and $B$
• D. $B$ and $C$

Answer 1

Answer: (C)

$B$ and $B$

Ionic bond is formed between elements having electronegativity difference.

Electronegativity order:A<B<C

So ionic bond can be formed between A and C, A and B and B and C.It cannot be formed between B and B.