S1.2 The nuclear atom Quiz
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5 questions, one answer each
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1. How many neutrons are in an atom of ²⁷Al (Z = 13)?
- A. 13
- B. 14
- C. 27
- D. 40
2. Which species has 18 electrons?
- A. Ar⁺
- B. K⁺
- C. Na⁺
- D. Cl
3. Which pair are isotopes?
- A. ¹⁴C and ¹⁴N
- B. ¹²C and ¹³C
- C. O₂ and O₃
- D. Na and Na⁺
4. Element Q has isotopes of mass 10 (20 %) and 11 (80 %). What is its Ar?
- A. 10.2
- B. 10.5
- C. 10.8
- D. 11.0
5. Which property would differ between atoms of ³⁵Cl and ³⁷Cl?
- A. Number of protons
- B. Number of electrons
- C. Chemical reaction with sodium
- D. Mass