Ionisation energies Quiz
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5 questions, one answer each
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1. Which equation represents the third ionisation energy of aluminium?
- A. Al(g) → Al³⁺(g) + 3e⁻
- B. Al⁺(g) → Al²⁺(g) + e⁻
- C. Al²⁺(g) → Al³⁺(g) + e⁻
- D. Al³⁺(g) → Al⁴⁺(g) + e⁻
2. Which Period 3 element has the lowest first ionisation energy?
- A. Sodium
- B. Magnesium
- C. Aluminium
- D. Argon
3. Why is the first ionisation energy of sulfur lower than that of phosphorus?
- A. Sulfur has a larger nuclear charge
- B. Sulfur's outer electron is in a 3s sub-shell
- C. Sulfur has fewer shells
- D. Two electrons in a 3p orbital of sulfur repel each other
4. An element has successive ionisation energies of 590, 1145, 4912 and 6491 kJ mol⁻¹. In which group is it?
- A. Group 1
- B. Group 2
- C. Group 3
- D. Group 4
5. Why does the first ionisation energy decrease down Group 2?
- A. The nuclear charge decreases
- B. The atoms have fewer electrons
- C. The outer electron is further away and more shielded
- D. The outer electron enters a p sub-shell