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Periodic trends

1. The graph of first ionization energies against atomic number (see Topics 2 & 12) exemplifies periodicity in classic style. But periodicity is not always so clear cut when other properties of the elements are plotted against atomic number. For example, consider the graph for melting points.Graph of melting points plotted against atomic number for the first 36 elements.There are some signs of periodicity. For example,...

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