Waec Model Questions Vol1 2018 Chemistry Question 1

Practice essay / theory question 1 from the 2018 Waec Model Questions Vol1 Chemistry examination. This question covers Atomic Structure .

Waec Model Questions Vol1 2018 Chemistry Essay / Theory
Topic: Atomic Structure
Question 1 WAEC_MODEL_QUESTIONS_VOL1 • 2018 • CHEMISTRY • essay
Waec Model Questions Vol1 2018 Chemistry Question 1 diagram

The diagram shows a neutral atom of sodium (Na). The nucleus contains protons and neutrons, and the electron shells are labelled K, L and M with the indicated numbers of electrons.

Question Parts

( a )
State the atomic number, mass number and the number of neutrons of the atom shown.
( b )
Write the full electron configuration of sodium in the order of increasing energy levels.
( c )
When the atom is placed in an electric discharge tube it emits yellow light of wavelength 589.0 nm. Identify the electronic transition responsible for this emission and, using the Bohr model, explain why this wavelength is observed.
( d )
An isotope of sodium, Na‑24, has a mass number of 24. Calculate the percentage of neutrons in this isotope relative to its mass number (express your answer to one decimal place).

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About This Question

This is Waec Model Questions Vol1 2018 Chemistry Question 1. It is one of the essay questions from the 2018 Waec Model Questions Vol1 Chemistry examination.

The question covers Atomic Structure .

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