O-LevelPhysicsNuclear Physics5054/22 · May/June 2015 · Q85 Marks
Two isotopes of hydrogen are written as H and H.
- (a)Complete Fig. 8.1 to show the number of protons and neutrons in one nucleus of each of these isotopes of hydrogen. [Figure 8.1] | | number of protons | number of neutrons | |---|---|---| | H | | | | H | | |[2]
- (b)Explain, using ideas about electrons, neutrons and protons, why atoms of H and Hare uncharged.[3]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2015). The mark or mark type is shown in brackets.
- [1] (a) left column both 1
- [1] (a) right column 0 and 1
- [1] (b) (at least one of the atoms) contain same number of electrons and protons
- or have 1 electron and 1 proton
- [1] (b) charge on electron and proton opposite
- or electron negative and proton positive
- or charge on electron neutralises/cancels/balances proton charge
- [1] (b) neutrons have no charge
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