По данным о распределении валентных электронов найдите элемент:
а)1s2^2s^1
б)1s^22s^22p^63s^23p^6
в)1s^22s^22p^63s^23p^4
г)1s^22s^22p^4
д) 1s^22s^22p^63s^23p^64s^1
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