Neco Model Questions Vol1 2022 Chemistry Question 1

Practice essay / theory question 1 from the 2022 Neco Model Questions Vol1 Chemistry examination. This question covers Atomic Structure .

Neco Model Questions Vol1 2022 Chemistry Essay / Theory
Topic: Atomic Structure
Question 1 NECO_MODEL_QUESTIONS_VOL1 • 2022 • CHEMISTRY • essay
Neco Model Questions Vol1 2022 Chemistry Question 1 diagram

The diagram shows a neutral atom of an element X. The nucleus contains 17 protons and 18 neutrons. The electrons are distributed in three shells: 2 electrons in the first shell, 8 electrons in the second shell and 7 electrons in the third shell.

Question Parts

( a )
State the atomic number, mass number and the total number of electrons of element X.
( b )
Write the electron configuration of element X in the energy‑level (K‑L‑M) notation.
( c )
Explain why element X readily gains one electron to form the X⁻ ion, referring to its position in the periodic table and its electron configuration.
( d )
Calculate the percentage by mass of element X in sodium chloride (NaCl) using the atomic masses: Na = 23 g mol⁻¹, Cl (element X) = 35.5 g mol⁻¹, Cl = 35.5 g mol⁻¹ (same as X).

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About This Question

This is Neco Model Questions Vol1 2022 Chemistry Question 1. It is one of the essay questions from the 2022 Neco Model Questions Vol1 Chemistry examination.

The question covers Atomic Structure .

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