Question

Atomic radius of Cu is greater than Cr but ionic radius of Cr2+ is greater than Cu2+
Why?

Answer 1

compare the number of protons and electrons in each atom and ion. The difference in electron distributions makes all the difference

Answer 2

I don't get it.
29 protons holding 27 electrons in Cu 2+ ion
3d9, 4s0 configuration
24 protons holding 22 electrons in Cr 2+ ion
3d4, 4s0 configuration

Answer 3

that's exactly the reason. the imbalance of proton\electron pull of each nucleus determines which ion will have a larger radius

Answer 4

What's the difference in the pull in this case?
I need a logical explanation

Answer 5

"What's the difference in the pull in this case?"

If you want a quantitative answer, calculate \(Z_{eff}\) for valence e using slater's rules