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每日 한 문제】이론적ฐาน2
선택 문제：제4기 원소가 해당 원자가 한 개의 전자를 잃어 양电价离子时
이 때 이온의 전자 배치식이 3d为3电层排布为33，则该 원소의 원자 번호는： A
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