| 21. | Core charge is a convenient way of explaining trends in the periodic table.
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| 22. | A simple numbering based on periodic table position was never entirely satisfactory, however.
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| 23. | Phthalocyanines form coordination complexes with most elements of the periodic table.
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| 24. | This behavior is responsible for the structure of the periodic table.
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| 25. | In 2009, sections of classes were named after elements in the periodic table.
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| 26. | Any periodic table group can also be used in this sense.
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| 27. | A chemical charge can be found by using the periodic table.
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| 28. | Edits at Periodic Table talk page are typical of other accounts.
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| 29. | Some consider Meyer and Mendeleev the co-creators of the periodic table.
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| 30. | It wasn't just the periodic table that had to be revised.
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