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WAEC Chemistry 2024 Paper

Question : 18

Total: 50

Solution:

Concept:

Ionization energy generally increases across a period from left to right.

Explanation:

All the elements given are in period

3

\mathrm{Al}

\mathrm{Si}

\mathrm{P}

, and

\mathrm{S}

Across a period, nuclear charge increases, so more energy is required to remove a valence electron.

Therefore, ionization energy increases in the order:

\mathrm{Al} < \mathrm{Si} < \mathrm{P} < \mathrm{S}

This order matches the arrangement:

\mathrm{Al}, \mathrm{Si}, \mathrm{P}, \mathrm{S}

Answer:

\mathrm{Al}, \mathrm{Si}, \mathrm{P}, \mathrm{S}

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