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# Long description

This figure represents an electron jump from shell n = 2 to n = 3. The figure is in two parts. Figure 7(a) is a schematic diagram representing an atom. It shows a nucleus (a circle) at the centre, with three concentric rings that represent its shells labelled (from inside to out) n = 1, n = 2 and n = 3. An electron is shown in the n = 2 shell. The diagram illustrates (using an arrow) than this electron jumps from n = 2 to n = 3. In (b) there are three horizontal lines labelled (from bottom to top) n = 1, n = 2 and n = 3. An arrow to the side of the lines indicates that there is increasing energy from n = 1 to n = 3. The gap between n = 1 and n = 2 is around two and a half times bigger than that between n = 2 and n = 3, indicating more energy is needed to move between n = 1 to n = 2 than from n = 2 to n = 3. The electron jump from part (a) is shown as an arrow between the lines, pointing from n = 2 to n = 3.