A carbon atom has a diameter of 1.5 × 10-10 m.
A thin carbon fibre is 3.0 × 10-6 m wide.
Estimate how many carbon atoms, placed side by side, would fit across the width of the fibre.
4.5×10−164.5\times10^{-16}4.5×10−16
5.0×10−55.0\times10^{-5}5.0×10−5
1.0×1041.0\times10^{4}1.0×104
2.0×1042.0\times10^{4}2.0×104
51 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.