21 Chemistry -- Classification of Elements and Periodic Table

A student reported that the radii of Cu, Cu+ and Cu++ are 96 pm, 122 pm and 72 pm respectively. Do you agree with the reported values? Justify the answer.

A student reported that the radii of Cu, Cu+ and Cu++ are 96 pm, 122 pm and 72 pm respectively. Do you agree with the reported values? Justify the answer.

Ans: No, I don't agree with reported values. The measurement is made wrongly. More the positive charge more will be the nuclear attraction and outermost electron is more attracted towards the nucleus and the atomic radius is less. So Cu++ < Cu+ < Cu should be the order. But the measurement shows Cu+ > Cu > Cu++  which can not be true.

More questions on Classification of Elements and Periodic Table

Which is bigger Li+ or Na+?

SimilarlyLi+would be the smallest because it has only 2 electrons and therefore the least electron- electron repulsion. When comparing F- and Na +, we have to be careful, as both of them have 10 electron,SoNa+is smaller due to thelargerattractive force of the protons.
Close Open App