Neco Model Questions Vol1 2018 Chemistry Question 24

Practice objective / multiple choice question 24 from the 2018 Neco Model Questions Vol1 Chemistry examination.

Neco Model Questions Vol1 2018 Chemistry Objective / Multiple Choice Easy Difficulty
Question 24 NECO_MODEL_QUESTIONS_VOL1 • 2018 • CHEMISTRY • objective

An element has atomic number 15. Write its ground‑state electron configuration and give two common oxidation states exhibited by this element.

Answer Options

A. Chlorine; electron configuration \(1s^2 2s^2 2p^6 3s^2 3p^5\); common oxidation states +1 and -1.
Correct Answer B. Phosphorus; electron configuration \(1s^2 2s^2 2p^6 3s^2 3p^3\); common oxidation states +3 and -3.
C. Sulfur; electron configuration \(1s^2 2s^2 2p^6 3s^2 3p^4\); common oxidation states +2 and -2.
D. Silicon; electron configuration \(1s^2 2s^2 2p^6 3s^2 3p^2\); common oxidation states +4 and -4.
Correct Answer
B
Correct Option:
Phosphorus; electron configuration \(1s^2 2s^2 2p^6 3s^2 3p^3\); common oxidation states +3 and -3.

About This Question

This is Neco Model Questions Vol1 2018 Chemistry Question 24. It is one of the objective questions from the 2018 Neco Model Questions Vol1 Chemistry examination.

Difficulty level: Easy .

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