Периодическая система химических элементов.
| пери-оды | ряды | группы элементов | |||||||||||||||||
| I | II | III | IV | V | VI | VII | VIII | ||||||||||||
| a | b | a | b | a | b | a | b | a | b | a | b | a | b | b | a | ||||
| 1 | 1 | ![]() |
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| 2 | 2 | ![]() |
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| 3 | 3 | ![]() |
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| 4 | 4 | ![]() |
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| 5 | ![]() |
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| 5 | 6 | ![]() |
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| 7 | ![]() |
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| 6 | 8 | ![]() |
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| 9 | ![]() |
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| 7 | 10 | ![]() |
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| высшие оксиды | ![]() |
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| летучие водородные соединения | ![]() |
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| лантаноиды | ![]() |
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| актиноиды | ![]() |
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