The valence shell electronic configuration of the most electronegative element is..........

With increasing atomic number in a certain period:

Electronic configuration of four elements $A, B, C$ and $D$ are given below $:$
$(A) 1s^2 2s^2 2p^3$
$(B) 1s^2 2s^2 2p^4$
$(C) 1s^2 2s^2 2p^5$
$(D) 1s^2 2s^2 2p^2$
Which of the following is the correct order of increasing electronegativity $(Pauling's scale)$?

Assertion $:$ Electronegativity of $Al$ is greater than $Tl$.
Reason $:$ In a Boron family,down the group regularly size increases.

Fluorine is a better oxidising agent than $Br_{2}$. It is due to

In which molecule does the chlorine atom have a positive partial charge?