March 2023 1 15 Report
Укажіть електронну формулу атома хімічного елемента, формула леткої сполуки із Гідрогеном якої ЕH4:
а) 1s22s22p63s23p5 б) 1s22s22p6
в) 1s22s22p63s2 г) 1s22s22p2 3s23p2
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