Waec Model Questions Vol1 2021 Chemistry Question 1

Practice essay / theory question 1 from the 2021 Waec Model Questions Vol1 Chemistry examination. This question covers Atomic Structure, Bohr model, Electron configuration, Oxidation states .

Waec Model Questions Vol1 2021 Chemistry Essay / Theory
Topics: Atomic Structure Bohr model Electron configuration Oxidation states
Question 1 WAEC_MODEL_QUESTIONS_VOL1 • 2021 • CHEMISTRY • essay
Waec Model Questions Vol1 2021 Chemistry Question 1 diagram

The diagram shows a simplified Bohr model of an unknown element. The nucleus contains 15 protons and 16 neutrons. The electron shells are labelled K, L and M. The K‑shell holds 2 electrons, the L‑shell holds 8 electrons and the M‑shell holds 5 electrons.

Question Parts

( a )
Write the chemical symbol and the name of the element shown in the diagram.
( b )
State the mass number of the element.
( c )
Confirm the number of neutrons present in the atom and explain how you obtained it.
( d )
Write the ground‑state electron configuration of the element using the Aufbau principle.
( e )
The element commonly exhibits oxidation states –3, +3 and +5. Explain, using its valence‑electron arrangement, why these oxidation states are possible.

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About This Question

This is Waec Model Questions Vol1 2021 Chemistry Question 1. It is one of the essay questions from the 2021 Waec Model Questions Vol1 Chemistry examination.

The question covers Atomic Structure, Bohr model, Electron configuration, Oxidation states .

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