Question

Which of the following has the least ionization potential among these metals ?

• A. $Li$
• B. $He$
• C. $N$
• D. $Zn$

Answer 1

Answer: (A)

$Li$

As the size of the atom is more than the ionisation potential will be less because as the size is the more nuclear force of attraction is less hence it requires less energy for the removal of electron and vice versa.
So among the given atoms $Li$ is having more size then it has least ionisation potential.