The elements in the ________ period of the periodic table have a core-electron configuration that is the same as the electron configuration of neon.
A)first
B)second
C)third
D)fourth
E)fifth

Question

Quizplus · Accepted Answer

The third period elements have a core-electron configuration that matches neon (Ne), as neon is the noble gas at the end of the second period. Elements in the third period start adding electrons to the 3s and 3p orbitals, building upon the electron configuration of neon.

The Elements in the ________ Period of the Periodic Table