O-LevelChemistryAtomic Structure5070/21 · May/June 2019 · Q15 Marks
Choose from the particles shown to answer the questions. ⁷⁹₃₅Br ³⁵₁₇Cl ³⁷₁₇Cl ²³₁₁Na ¹⁷₈O ³⁹₂₀Ca ³⁷₁₇Cl⁻ ⁶⁴₂₉Cu ²⁰₁₀Ne ¹⁸₈O²⁻ Each particle can be used once, more than once or not at all.
- (a)Which particle has only 20 protons in its nucleus?[1]
- (b)Which particle has a nucleon number of 35?[1]
- (c)Which particle has an electronic structure of 2.8.8?[1]
- (d)Which particle is an atom with only 10 neutrons in its nucleus?[1]
- (e)Which particle is an atom of a transition element?[1]
Mark scheme
Marking points from the official mark scheme (May/June 2019). The mark or mark type is shown in brackets.
- [1] ³⁹₂₀Ca (1)
- [1] ³⁵₁₇Cl (1)
- [1] ³⁷₁₇Cl⁻ (1)
- [1] ²⁰₁₀Ne (1)
- [1] ⁶⁴₂₉Cu (1)
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