Question

Why are the radius of Na+ and Cu+ ions almost same?

Answer 1

QuEsTiOn

Why are the radius of Na+ and Cu+ ions almost same?

AnSwEr

Atomic radius is inversely proportional to the effective nuclear charge.

As we move from left to right in a period the effective nuclear charge increases.

This will decrease the radius of an atom.

At the same time, in transition elements the number of electrons in the 3d sub-shell will increase.

This will repel the already present 4s electrons.

This repulsion will increase the atomic radius.

In Fe, Co, Ni & Cu both the effects nearly balance each other keeping the atomic radius same.

• Hope it helps...