1수소H/2헬륨He/3리튬Li/4베릴륨Be/5붕소B/6탄소C/7질소N/8산소O/9플루오린F/10네온Ne/11나트륨Na/12마그네슘Mg/13알루미늄Al/14규소Si/15인P/16황S/17염소Cl/18
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