Question

The size of iso-electronic species Cl^-, Ar and Ca²⁺ is affected by ______.

Options

• Azimuthal quantum number of valence shell

• Electron electron interaction in the outer orbitals 

• Principal quantum number of valence shell

• Nuclear charge

Answer 1

The size of iso-electronic species Cl^-, Ar and Ca²⁺ is affected by Nuclear charge.

Explanation:

For any atom or ion `("Z"/"e") prop 1/"r"` where Z = atomic or nuclear charge e = nuclear of electron and r = radius of atom or ion. Since `"Z"/"C"` varies inversely with ionic radius. `"Z"/"e"` decrease in magnitude results in an increase in ionic radius.

For Cl^-; `"Z"/"e" = 17/18`

`"Ar", "Z"/"e" = 18/18`

`"Ca"^(2+) "Z"/"e" = 20/18`

So, the order is [Cl^- > Ar > Ca²⁺]