Which of the following is not true of metals?

The correct option is C

Metals form non-polar covalent compounds.

Explanation for correct option (c):The statement which is incorrect about metals is:

• The metals are the substances which are electropositive in nature.
• They have $1$, $2$, or $3$ electrons in their valence shell, and they lose them to form a cation.
• Due to the presence of free electrons, they behave as good conductors of electricity.
• Also, they are malleable and ductile due to this reason.
• They form ionic compounds which are polar.
• Therefore, option (c) metals form non-polar covalent compounds is not true about metals.

Explanation for incorrect option (a):

(a) Metals are good conductors of electricity.
The presence of free electrons in metals makes them good conductors of electricity.

Explanation for incorrect option (b):

(b) Metals are malleable and ductile.
This option is true about metals.

Explanation for incorrect option (d):

(d) Metals will have $1$ or $2$ or $3$ electrons in their valence shell.

The group $\mathrm{I}\left(\mathrm{A}\right)$,$\mathrm{II}\left(\mathrm{A}\right)$, $\mathrm{III}\left(\mathrm{A}\right)$ are metals, and they have $1$, $2$, or $3$ electrons in their valence shell.