What is the number of unpaired electrons present in ground state of Silicon and Chromium, respectively ?

Identify the most electronegative element by the following.

What is the total number of electrons present in bonding and antibonding orbitals respectively in $\text{F}_2$ molecule according to MO theory ?

At constant temperature, a gas occupies a volume of 200 mL at a pressure of 500 mm Hg. What will be its volume at 800 mm Hg pressure?