The radius of a gold atom is 1.4 × 10-10 m.
The radius of the nucleus of the gold atom is 7.0 × 10-15 m.
Give the typical size (order of magnitude) of an atom, in metres.
Calculate how many times larger the radius of the atom is than the radius of its nucleus.
A teacher makes a model of the gold atom. The nucleus is shown by a pea of radius 0.40 cm.
Calculate the radius of the model atom.
Give your answer in metres.
Use your answer to (c) to explain why an atom is described as mostly empty space.
103 exam-style questions on Edexcel GCSE Physics 6.1 Atomic structure and isotopes, covering 6.1.1 Structure of the atom, 6.1.2 Isotopes: atomic and mass number, 6.1.3 Sub-atomic particles: masses and charges, and 6.1.4 Electron orbits and energy changes. Each one has a worked solution and a mark scheme showing where the marks go.