Question

Which of the following has the highest first
ionization potential
(1)
Al
(2)
Si
(3) K
4 P​

Answer 1

the highest first ionization potential is p

Answer 2

Answer:

Ionization potential increases left to right in a period, but in case of nitrogen and oxygen, ionization potential for nitrogen is greater. Nitrogen has stable half filles p-orbital configuration in comparison to oxygen.