Which electron configuration represents the electrons in an atom of sodium in the ground state at S

January 2019 NY Regents Chemistry Exam

5 Which electron configuration represents the electrons in an atom of sodium in the ground state at STP?

(1) 2-8-1

(2) 2-7-2
(3) 2-8-6

(4) 2-7-7

Solution: We can find the electron configuration of an atom of sodium (Na) in the ground state on the Periodic Table. It is located at the bottom of the sodium block and is 2-8-1

Answer: 1

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