September 2021 1 37 Report
Высший оксид и гидроксид элемента главной подгруппы IV группы Периодической системы соответствуют общим формулам: А. ЭО2 и Н2ЭО3. Б. Э2О5 и Н3ЭО4. В. ЭО3 и Н2ЭО4. Г. Э2О7 и НЭО4.
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