AP Chemistryhardmcq1 pt
How many peaks appear in the photoelectron spectrum of a magnesium atom (1s² 2s² 2p⁶ 3s²)?
A.4
B.12
C.3
D.2
Explanation
Core Concept
PES gives one peak per subshell energy: 1s, 2s, 2p, and 3s. Four occupied subshells produce four peaks, with heights 2, 2, 6, and 2 electrons respectively.
Correct Answer
A4
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