Определите электронную формулу атома Феррума
А.1s2 2s2 2p6 3s1
Б.1s2 2s2 2p6 3s2 2p6 4s2
B.1s2 2s2 2p6 3s2 3p6 3d6 4s2
Г.1s2 2s2 2p6 3s2 2p6 3d8 4s2
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