Как мне определить какой это элемент [tex]1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{10}5p^{6}6s^{2}4f^{14}5d^{10}6p^{6}7s^{1}[/tex]] ??? С пояснением пожалуйста. ДАЙ 50 БАЛОВ (потратил 100)!!
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