The most electronegative element from the following elements is:

Give the appropriate term defined by the statement given below:

The tendency of an atom to attract electrons towards itself when combined in a covalent compound.

Arrange the following according to the instructions given in bracket:

$\mathrm{Li}, \mathrm{K}, \mathrm{Na}, \mathrm{H}$ (In the decreasing order of their ionisation potential)

Arrange the following according to the instruction given in bracket:

$\mathrm{F}, \mathrm{B}, \mathrm{N}, \mathrm{O}$ (In the increasing order of electron affinity)

Give one word for the following statement:

• The tendency of an atom to attract electrons to itself when combined in a compound.

The following table represents the elements and the atomic number. With reference to this, answer the following using only the alphabets given in the table.

Which element has an electron affinity zero?

Name the following element:

• An alkaline earth metal present in group $2$ and period $3$.

Name the following element:

• A trivalent metal used to make light tools.