Which of the Following Statements About the Periodic Table Is

Which of the following statements about the periodic table 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 are isoelectronic must 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 they 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.
E) Fluorine is the most electronegative element due to its size and nuclear charge.