O-LevelChemistryAtomic Structure5070/21 · May/June 2017 · Q27 Marks
(a) Atoms and ions contain three types of sub-atomic particle. Complete the table about these sub-atomic particles. sub-atomic particle | relative charge | relative mass --- | --- | --- electron | | neutron | | 1 proton | +1 | (b) The table shows some information about six particles. particle | number of protons in particle | number of neutrons in particle | number of electrons in particle --- | --- | --- | --- A | 37 | 48 | 37 B | 53 | 74 | 54 C | 92 | 143 | 92 D | 92 | 143 | 89 E | 92 | 146 | 92 F | 94 | 150 | 92
- (a)Atoms and ions contain three types of sub-atomic particle. Complete the table about these sub-atomic particles. sub-atomic particle | relative charge | relative mass --- | --- | --- electron | | neutron | | 1 proton | +1 | [3]
- (b)(i)What is the nucleon number for particle A?[1]
- (b)(ii)Explain why particle B is a negative ion.[1]
- (b)(iii)Which two atoms are isotopes of the same element? and Explain your answer.[2]
Mark scheme
Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.
- A2(a) sub-atomic particle | relative electric charge | relative mass
- electron | -1 | 0 / 0.0005
- neutron | 0 | 1
- proton | +1 | 1
- All four correct (3)
- Three correct (2)
- Two correct (1)
- One correct (0)
- A2(b)(i) 85 (1)
- A2(b)(ii) Has more electrons than protons (1)
- A2(b)(iii) C and E (1)
- Same number of protons but different number of neutrons (1)
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