Question

Which of the following periodic trends is false?

a) Elements in the same column have similar reactivities because their valence electrons tend to be located in the same types of orbitals.

b) A series of ions that isoelectric (contain the same number of electrons) in their ground states have the same electron configuration.

c) The atomic size of the elements increases going across a period from left to right because the number of electrons increases, so the electrons are located further from the nucleus.

d) It takes more energy to remove an electron from lithium than from cesium because the valence electrons in lithium are located closer to the nucleus.