+6 = 14 

ㄉㄧㄡdiū

  1. (thulium,Tm)​化學元素原子序69。金屬元素銀白色作用緩慢鹽類綠色主要礦石一般離子交換取得

thulium (chemistry)​
thulium
Thulium (S, Chem)​