| 21. | Chromium ( Cr ) is an element of the Periodic Table.
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| 22. | For elements lighter than iron on the periodic table, nuclear fusion releases energy.
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| 23. | For instance, do elements contained on the periodic table have plurals?
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| 24. | "It " is the Periodic Table of Elements, that ubiquitous classroom wall chart.
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| 25. | Unpaired electrons arise inevitably as you move down the periodic table toward larger atoms.
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| 26. | Russian chemist Dmitry Mendeleev invented the Periodic table, the main framework of modern chemistry.
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| 27. | Such relationship occurs because crossing rightward and descending the periodic table have opposite effects.
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| 28. | These materials are classified according to the periodic table groups of their constituent atoms.
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| 29. | This almost equal abundance is rare in the periodic table.
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| 30. | The periodic table was incredibly beautiful, the most beautiful thing I had ever seen,
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