S1.2 The nuclear atom Quiz
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5 questions, one answer each
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1. A mass spectrum of element X shows peaks at m/z 63 (69 %) and 65 (31 %). What is Ar?
- A. 63.0
- B. 63.6
- C. 64.0
- D. 64.4
2. What does the tallest peak in the mass spectrum of an element represent?
- A. The heaviest isotope
- B. The most abundant isotope
- C. The ion with the highest charge
- D. The molecular ion
3. A peak appears at m/z = 17.5 in the spectrum of chlorine. What ion causes it?
- A. ³⁵Cl⁺
- B. ³⁵Cl²⁺
- C. ³⁷Cl²⁺
- D. ³⁵Cl₂⁺
4. How many neutrons are in ⁵⁸Ni²⁺ (Z = 28)?
- A. 26
- B. 28
- C. 30
- D. 58
5. Two lead samples have the same Ar. What can be concluded?
- A. They must come from the same mine
- B. They must have identical isotope abundances
- C. They may still have different isotope abundances
- D. They contain different elements