Symbol As A highly poisonous metallic element having three allotropic forms, yellow, black, and gray, of which the brittle, crystalline gray is the most common.

• See table at element 符号 As 砷：一种有剧毒的金属元素，有黄、黑、灰三种同素异形体，其中质脆，结晶体的灰色形体最为常见。