Neco 2024 Chemistry Question 31

Practice objective / multiple choice question 31 from the 2024 Neco Chemistry examination.

Neco 2024 Chemistry Objective / Multiple Choice Easy Difficulty
Question 31 NECO • 2024 • CHEMISTRY • objective

An atom of an element has atomic number \(15\) and mass number \(31\). Determine the number of protons, neutrons and electrons in a neutral atom, and write its ground‑state electron configuration using the Aufbau principle up to the \(3p\) subshell.

Answer Options

Correct Answer A. Protons = 15, Neutrons = 16, Electrons = 15; electron configuration: \(1s^{2}\,2s^{2}\,2p^{6}\,3s^{2}\,3p^{3}\)
B. Protons = 15, Neutrons = 16, Electrons = 14; electron configuration: \(1s^{2}\,2s^{2}\,2p^{6}\,3s^{2}\,3p^{2}\)
C. Protons = 15, Neutrons = 15, Electrons = 15; electron configuration: \(1s^{2}\,2s^{2}\,2p^{6}\,3s^{2}\,3p^{3}\)
D. Protons = 15, Neutrons = 16, Electrons = 15; electron configuration: \(1s^{2}\,2s^{2}\,2p^{6}\,3s^{1}\,3p^{4}\)
Correct Answer
A
Correct Option:
Protons = 15, Neutrons = 16, Electrons = 15; electron configuration: \(1s^{2}\,2s^{2}\,2p^{6}\,3s^{2}\,3p^{3}\)

About This Question

This is Neco 2024 Chemistry Question 31. It is one of the objective questions from the 2024 Neco Chemistry examination.

Difficulty level: Easy .

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