AP Chemistryhardmcq1 pt
A PES spectrum shows a valence peak (lowest binding energy) holding 3 electrons, taller than its neighbor peaks. Which element could produce this spectrum?
A.N (1s² 2s² 2p³)
B.Ne (1s² 2s² 2p⁶)
C.Li (1s² 2s¹)
D.B (1s² 2s² 2p¹)
Explanation
Core Concept
Nitrogen's valence subshell 2p holds 3 electrons, making its lowest-binding-energy peak (height 3) taller than the 1s and 2s peaks (height 2 each). This is nitrogen's unique PES signature among small atoms.
Correct Answer
AN (1s² 2s² 2p³)
More Unit 1: Atomic Structure and Properties practice questions
- mediumWhy does atomic radius decrease across a period from Li to F?
- easyWhich element has the largest atomic radius: S, Se, or Te?
- easyWhich orbital diagram for carbon's 2p subshell is correct (arrows represent electrons)?
- mediumA 34.0 g sample of NH₃ contains how many moles of hydrogen atoms?
- mediumHow many atoms are in 9.0 g of water (molar mass 18.0 g/mol)?
Practice more AP Chemistry questions with full explanations
Practice Unit 1: Atomic Structure and Properties Questions →