O-LevelChemistryAtomic Structure5070/22 · May/June 2017 · Q28 Marks
The table shows some information about six particles. (a) Complete the table. particle | proton (atomic) number | number of neutrons in particle | number of electrons in particle ---|---|---|--- ³⁵Cl | 17 | 18 | ... | 17 | 20 | 17 ³⁹K⁺ | 19 | ... | 18 ⁷⁹Br⁻ | ... | 44 | 36 ⁸¹Br | 35 | ... | 35 ... | 37 | 48 | 36
- (a)Complete the table.[6]
- (b)(i)What is meant by the term isotopes?[1]
- (b)(ii)Identify two atoms which are isotopes of the same element.[1]
Mark scheme
Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.
- A2(a) ³⁵Cl: number of electrons in particle: 17 (1)
- A2(a) Particle: ³⁷Cl (1), proton (atomic) number: 17, number of neutrons in particle: 20, number of electrons in particle: 17
- A2(a) ³⁹K⁺: number of neutrons in particle: 20 (1)
- A2(a) ⁷⁹Br⁻: proton (atomic) number: 35 (1)
- A2(a) ⁸¹Br: number of neutrons in particle: 46 (1)
- A2(a) Particle: ⁸⁵Rb⁺ (1), proton (atomic) number: 37, number of neutrons in particle: 48, number of electrons in particle: 36
- A2(b)(i) Atoms with same number of protons but different number of neutrons / atoms with same atomic number but different nucleon number / atoms of the same element with different number of neutrons
- A2(b)(ii) ³⁵Cl and ³⁷Cl
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