January 2020 Ny Regents Chemistry Exam
32 Which electron configuration could represent the electrons in a sodium atom in an excited state?
(1) 2-8
(2) 2-8-1 (3) 2-7-1
(4) 2-7-2
Solution: The electron configuration for sodium in its most stable, ground state can be found on the Periodic Table. It is 2-8-1. When an electron gets excited, it goes to the higher energy level. For example, 2-7-2, means that the electron from the second level jumped to the third level.
Answer: 4
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