NY Regents Chemistry Exam August 2023 Question 34
34 Which change in electron location in an atom of calcium is accompanied by the greatest amount of energy emitted?
(1) from shell 1 to shell 2
(2) from shell 2 to shell 1
(3) from shell 1 to shell 4
(4) from shell 4 to shell 1
Solution: Energy is absorbed when an electron travels from a lower to a higher energy level. Energy is emitted when an electron travels from a higher to a lower energy level. We can eliminate choices 1 and 3 because electron is traveling from a lower to a higher energy level. For choices 2 and 4, we go from shell 2 to 1 or shell 4 to 1. Going from shell 4 to 1 will result in the greatest amount of energy emitted. Choice 4 is correct.
Choice 3
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