Waec Model Questions Vol1 2020 Chemistry Question 1

Practice essay / theory question 1 from the 2020 Waec Model Questions Vol1 Chemistry examination. This question covers Atomic structure, Bohr model, Electron configuration, Ionic formation, Periodic trends .

Waec Model Questions Vol1 2020 Chemistry Essay / Theory
Topics: Atomic structure Bohr model Electron configuration Ionic formation Periodic trends
Question 1 WAEC_MODEL_QUESTIONS_VOL1 • 2020 • CHEMISTRY • essay
Waec Model Questions Vol1 2020 Chemistry Question 1 diagram

The diagram shows a Bohr model of an unknown element X. The nucleus contains 15 protons and 16 neutrons. The electron shells are labelled K, L and M with 2, 8 and 5 electrons respectively.

Question Parts

( a )
State the atomic number (Z) and the mass number (A) of element X.
( b )
Write the ground‑state electron configuration of X using the Aufbau principle (show the distribution in K, L and M shells).
( c )
The element commonly forms a cation in its compounds. Indicate the most likely ionic charge of X and write the electron configuration of the ion formed.
( d )
Explain, using the diagram, why the ionisation energy of X is expected to be lower than that of the element immediately to its right in the same period.

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About This Question

This is Waec Model Questions Vol1 2020 Chemistry Question 1. It is one of the essay questions from the 2020 Waec Model Questions Vol1 Chemistry examination.

The question covers Atomic structure, Bohr model, Electron configuration, Ionic formation, Periodic trends .

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