+6 = 14 

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  1. (hafnium,Hf)​化學元素原子序72。灰色晶體化學性質機械性能核反應器控制桿材料合金高壓放電電極

hafnium (chemistry)​
hafnium
Hafnium (Element 72, Hf)​ (S, Chem)​