Neco 2020 Chemistry Question 15

Practice objective / multiple choice question 15 from the 2020 Neco Chemistry examination.

Neco 2020 Chemistry Objective / Multiple Choice Easy Difficulty
Question 15 NECO • 2020 • CHEMISTRY • objective
Neco 2020 Chemistry Question 15 diagram

The diagram shows a neutral atom of element X with electrons distributed as follows: 2 electrons in the K shell, 8 electrons in the L shell and 7 electrons in the M shell. Determine the atomic number of X, identify the element, and write its ground‑state electron configuration.

Answer Options

Correct Answer A. Z=17, element Cl, configuration 1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{5}
B. Z=17, element Cl, configuration 1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6}
C. Z=16, element S, configuration 1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{4}
D. Z=18, element Ar, configuration 1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6}
Correct Answer
A
Correct Option:
Z=17, element Cl, configuration 1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{5}

About This Question

This is Neco 2020 Chemistry Question 15. It is one of the objective questions from the 2020 Neco Chemistry examination.

Difficulty level: Easy .

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