Cho 3 nguyen to A(Z=4) B (Z=10) ,C ( Z=15) a, hay viet cau hinh electron cua A,B,C tu cau hinh electron em hay suy ra vi tri cua 3 nguyen to tren trong bang tuan hoan ,b, cho biet cac nguyen to A,B,C thuoc loai nguyen to nao
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