Waec Model Questions Vol1 2018 Chemistry Question 2

Practice essay / theory question 2 from the 2018 Waec Model Questions Vol1 Chemistry examination. This question covers periodic table, electron configuration, periodic trends, ionic compounds .

Waec Model Questions Vol1 2018 Chemistry Essay / Theory
Topics: periodic table electron configuration periodic trends ionic compounds
Question 2 WAEC_MODEL_QUESTIONS_VOL1 • 2018 • CHEMISTRY • essay
Waec Model Questions Vol1 2018 Chemistry Question 2 diagram

The diagram shows the Bohr model of an unknown element X. The model displays four electron shells labelled K, L, M and N containing 2, 8, 8 and 2 electrons respectively.

Question Parts

( a )
Identify the element X. State its chemical symbol and atomic number.
( b )
Write the ground‑state electron configuration of element X in (i) long form and (ii) noble‑gas shorthand.
( c )
When element X reacts with a halogen (group 17 element), what ion does X form? Write the chemical formula of the binary compound formed with chlorine.
( d )
Using periodic trends, explain why the first ionisation energy of element X is lower than that of its immediate predecessor in the same period.

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About This Question

This is Waec Model Questions Vol1 2018 Chemistry Question 2. It is one of the essay questions from the 2018 Waec Model Questions Vol1 Chemistry examination.

The question covers periodic table, electron configuration, periodic trends, ionic compounds .

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