Question

Why is the radius of a neutral metal atom always larger than the radius of a positive ion?

A. The nucleus repels the remaining electrons.

B. The positive ion has lost its outer level.

C. The atomic orbitals contract all by themselves.

D. The number of principal energy levels is always increased.

E. The metal's outer level is completely filled.

Answer 1

Can anybody explain?

Answer 2

The trend of smaller atoms across a period is caused by the increasing positive charge of the nucleus, which attracts electrons towards the nucleus. The attraction would then decrease the radius in a cation (positive ion). A neutral atom has no charge. Thus, the radius remains the same.

Answer 3

so D is the correct answer?

Answer 4

I would say B, actually. No principle energy levels have been added to either the atom or the ion, but the ion may have lost its outer one in becoming an ion.

Answer 5

Thanks!

Answer 6

Cool cool :)