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

Keeping in view the periodic law and the periodic table,suggest which of the following elements should have the maximum electronegative character.

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.

Which one of the following correctly represents the variation of electronegativity $(EN)$ with atomic number $(Z)$ of group $13$ elements?

What is electronegativity? Explain its periodicity in the periodic table.

Which of the following elements never shows a positive oxidation number?