[00:01.700]钾钠银氢正一价
[00:04.000]钙镁钡锌正二价
[00:06.500]氟氯溴碘负一价
[00:08.500]通常氧为负二价
[00:13.500]正三铝 正四硅 正五氮磷
[00:18.900]二三铁 二六碳
[00:23.700]负二四六硫