+12 = 20

ㄌㄠˊláo

ㄌㄠˊláo
  1. (lawrencium,Lr)​化學元素原子序103。人工合成放射性元素
lawrencium (chemistry)​
Lawrencium (Element 103, Lr)​ (S, Chem)​
lawrencium