O-LevelPhysicsNuclear Physics5054/21 · Oct/Nov 2022 · Q57 Marks
Fig. 5.1 is a diagram that shows the number of particles in a charged atom (ion) of beryllium (Be).
- (a)(i)Deduce, from the charge on the ion, the number of protons in its nucleus. Show your working.[2]
- (a)(ii)Write down, in nuclide notation, the symbol for the nucleus of this charged atom.[1]
- (b)The isotope in Fig. 5.1 is the only stable isotope of beryllium. Explain the term 'isotope'.[2]
- (c)Explain what prevents electrons in an atom from escaping.[2]
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 (Oct/Nov 2022). The mark or mark type is shown in brackets.
- [1] 3.2 × 10⁻¹⁹ / (−)1.6 × 10⁻¹⁹ or 2 more protons than electrons shown by charges
- [1] (2 + 2 =) 4
- [1] ⁹₄Be
- [1] a form of an element
- [1] with a particular number of neutrons / nucleons
- [1] electrons and nucleus opposite charged or electrons negative and nucleus positive
- [1] (electrostatic / electric) force of attraction or unlike charges attract
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