Atomic radii increase when going down a group and decreases when going towards the anion periods. So A and D.
I’m pretty sure 8 as well because elctrouns can’t hold more than that
The name of the covalent compound CCl4 is 'Carbon tetrachloride'.
Hope this helps!
Explanation:
It is given that r = 0.283 nm. As 1 nm =
.
Hence, 0.283 nm = 
- Formula for coulombic energy is as follows.

where, e =
C
= 

= 
- As 1 eV =

So, 1 J = 
Hence, U = 
= 8.9 eV
- Also, 1 J =

=
kJ/mol
Therefore, U =
kJ/mol
= 