Question Detail

CHM 101 Quantum Theory and Atomic Structure Objective Question
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Question

What is the electron configuration for phosphorus (atomic number 15)?
Options
A 1s² 2s² 2p⁶ 3s² 3p²
B 1s² 2s² 2p⁶ 3s² 3p³
Correct Answer
C 1s² 2s² 2p⁶ 3s² 3p⁴
D 1s² 2s² 2p⁶ 3s² 3p⁵
Correct Answer

Option B is the correct answer.

Detailed Explanation

Phosphorus has atomic number 15, requiring 15 electrons. The electron configuration fills in order: 1s² (2), 2s² (4), 2p⁶ (10), 3s² (12), and then 3p³ (15). The 3p³ configuration, according to Hund's rule, results in three unpaired electrons.

Hint

Fill orbitals in order of increasing energy until reaching 15 total electrons.

Question Info

Course: CHM 101
Topic: Quantum Theory and Atomic Structure
Type: Objective
Difficulty: Not specified
Question 1525 of 1872
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