An atom has 15 protons and 16 neutrons.
Use the Periodic Table.
Which symbol represents this atom?
1516P{}^{16}_{15}\mathrm{P}1516P
1631S{}^{31}_{16}\mathrm{S}1631S
3115Ga{}^{15}_{31}\mathrm{Ga}3115Ga
1531P{}^{31}_{15}\mathrm{P}1531P
101 exam-style questions on OCR GCSE Chemistry 1.2 Atomic structure, covering 1.2.1 Development of the atomic model, 1.2.2 The nuclear model and the size of atoms, and 1.2.3 Subatomic particles in atoms and ions. Each one has a worked solution and a mark scheme showing where the marks go.