Regents Chemistry August 2022
33 Which electron configuration represents the electrons of an atom in an excited state?
(1) 2-7-3
(2) 2-8-2 (3) 2-8-8-1
(4) 2-8-9-2
Explanation: An electron in an excited state is an electron that moved from the ground state to a higher energy level. The first level has a maximum of 2 electrons, the second level has a maximum of 8 electrons. As we see in the answer choice 1, instead of being 2-8-2, the electron moved from the second energy level to the third becoming 2-7-3.
Answer: 1