Waec Model Questions Vol1 2019 Chemistry Question 2

Practice essay / theory question 2 from the 2019 Waec Model Questions Vol1 Chemistry examination. This question covers Periodic Table .

Waec Model Questions Vol1 2019 Chemistry Essay / Theory
Topic: Periodic Table
Question 2 WAEC_MODEL_QUESTIONS_VOL1 • 2019 • CHEMISTRY • essay

The diagram presents a segment of the periodic table covering periods 2 and 3 and highlighting groups 1, 2, 16 and 17. The elements shown are: Period 2: Li, Be, B, C, N, O, F, Ne Period 3: Na, Mg, Al, Si, P, S, Cl, Ar.

Question Parts

( a )
Write the electron configuration of the following elements using noble‑gas shorthand: (i) Sodium (Na) (ii) Sulfur (S) (iii) Chlorine (Cl)
( b )
Explain why the elements in group 16 exhibit similar chemical properties. Include reference to valence electrons and typical oxidation states.
( c )
A compound is formed between an element from group 1 and an element from group 16 that both belong to period 3. Write the chemical formula of the compound and calculate its molar mass. (Use atomic masses: Na = 22.99 g mol⁻¹, S = 32.07 g mol⁻¹.)

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About This Question

This is Waec Model Questions Vol1 2019 Chemistry Question 2. It is one of the essay questions from the 2019 Waec Model Questions Vol1 Chemistry examination.

The question covers Periodic Table .

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