January 2019 NY Regents Chemistry Exam
3 In the ground state, valence electrons of a krypton atom are found in
(1) the first shell (2) the outermost shell (3) both the nucleus and the first shell (4) both the first shell and the outermost shell
Solution: Valence electrons of an atom of any element are electrons that are found in the outermost shell.
Answer: 2
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