Question

Why the size of oxygen is larger than nitrogen atom?

Answer 1

Answer:

oxygen has same number of shells as nitrogen. Thus electrons in oxygen atom will be closer to nucleus than in the case of nitrogen. ... When electrons are closer it means atomic radius is smaller. When electrons are farther away from nucleus atomic radius is also larger.

hope it help u........

Answer 2

Explanation:

Your question's wrong, atomic radius decreases as we move from left to right along a period.

This is because,

◆The number of shells in an atom remain same along the period

◆But number of proton increases

◆As a result the z-effective increases and thus the atom becomes smaller

Now the radius of Oxygen is slightly greater than fluorine because Oxygen is the 1st element where the electrons start pairing in p - orbital. Since it is the 1st time electrons pair in the p-orbital repulsion takes over and thus it's size increases slightly from that of fluorine