NZ Scholarship Chemistry Practice Questions - New Zealand Scholarship Chemistry Assessment (Standard 93102) Exam

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The first four ionisation energies of an unknown Period 3 element X are 786, 1577, 3232, and 4356 kJ mol^-1, while its fifth ionisation energy jumps dramatically to 16,091 kJ mol^-1. Which element is X?

Aluminium (Al) Silicon (Si) Phosphorus (P) Sulfur (S)

Correct Answer:

Silicon (Si)

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