O-LevelPhysicsNuclear Physics5054/21 · Oct/Nov 2014 · Q86 Marks
The nuclide notation for the radioactive isotope boron-12 is ¹²₅B.
- (a)In the space below, draw a labelled diagram to illustrate the structure of a neutral atom of this isotope. Show all the particles in the atom.[4]
- (b)(i)As boron-12 decays, it emits a beta-particle. A new atom is produced. Determine the proton number (atomic number) of the new atom,[1]
- (b)(ii)the nucleon number (mass number) of the new atom.[1]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2014). The mark or mark type is shown in brackets.
- [4] (a) neutrons and protons together and alone in the middle
- 5 protons
- 7 neutrons (if protons and neutrons unlabelled 1/2)
- 5 electrons and electrons surrounding nucleus
- [1] (b) (i) 6
- [1] (b) (ii) 12
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