Classification ...

Among fluorine and chlorine, the electron affinity of the latter is high. This is due to:

Which of the following has zero electron affinity?

The electron affinity values (kJmol$$^{-1}$$) of three halogens $$X,\ Y $$ and $$Z$$ respectively are $$-349$$, $$-333 $$ and $$-325$$. Then $$X,\ Y $$ and $$Z$$ respectively are :

Number of short periods in Mendeleev's periodic table is :

In a period, elements are arranged strictly in a sequence of:

Considering the chemical properties, atomic weight of $$Be$$ was corrected based on:

What is the atomic number of another element present in the same group as the element with $$Z = 13$$?

The order of electron affinities of $$N,\ O,\ S\ $$and$$\ Cl$$ are :

Which of the following will have almost positive $$EA_{1}$$?

Beryllium shows diagonal relationship with aluminium. Which of the following similarity is incorrect?