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Why do the properties of elements change in a regular way across a period...
Mathematics, 02.12.2019 11:31
Mathematics, 02.12.2019 11:31
Mathematics, 02.12.2019 11:31
Chemistry, 02.12.2019 11:31
Mathematics, 02.12.2019 11:31
Mathematics, 02.12.2019 11:31