AP Chemistrymediummcq1 pt
The electron configuration of a ground-state oxygen atom is:
A.1s² 2s² 2p⁶
B.1s² 2s² 2p⁴
C.1s² 2s² 2p³ 3s¹
D.1s² 2s¹ 2p⁵
Explanation
Core Concept
Oxygen has 8 electrons. Following the Aufbau principle, the configuration is 1s² 2s² 2p⁴.
Correct Answer
B1s² 2s² 2p⁴
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 →