Answer:
Ne
Explanation:
Comparing Ne and Na, Neon atoms will have the greatest ionization energy.
The ionization energy is the energy required to remove the most loosely held electrons within an atom.
- As we go down the group, ionization energy decreases due to increase in the atomic radius
- Across a period it increases from left to right
- So, since Ne is right of Na, it has a higher ionization energy.
- It is also an inert gas and they have high ionization energy
