Руководствуясь Периодической системой химических элементов Д.И. Менделеева, определите порядковый номер элемента по сокращенной электронной формуле его нейтрального атома, укажите названия и символы этих элементов: а) [Ar]4s²3d⁶; б) [He]2s²2p⁵; в) [Kr]5s²4d¹⁰5p¹.
Rondov
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28.02.2021 18:51
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