The values of electronegativity of atoms $A$ and $B$ are $1.20$ and $4.0$ respectively. The percentage of ionic character of $A-B$ bond is ............. $\%$

The element with the highest electronegativity value after fluorine $(F)$ is:

Assertion : Electron affinity refers to an isolated atom's attraction for an additional electron while electronegativity is the ability of an atom of an element to attract electrons towards itself in a shared pair of electrons.
Reason : Electron affinity is a relative number and electronegativity is experimentally measurable.

The electronegativities of $C, N, Si$ and $P$ are in the order of

The nature of the bond formed between two elements depends on the

In which of the following pairs of elements is the electronegativity of the first element less than that of the second element?