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Which electron configuration could represent the electrons in a sodium atom in an excited state?

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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