AP Chemistry· difficulty 3/5
A photoelectron spectrum has 4 peaks with intensity ratios 2:2:6:2 (left to right, decreasing binding energy).
The element corresponds to:
Aluminum
Silicon
Magnesium
Sodium
Explanation
Configuration 1s^2 2s^2 2p^6 3s^2 (intensities 2:2:6:2) matches Mg.
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