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砷(Arsenic,As)一、理化性质砷元素有灰、黄、黑色三种同素异形体，质脆而硬，具有金属性。原子量74.9，熔点818℃，沸点615℃，可升华。不溶于水，可溶于硝酸和王水，生成砷酸(H3AsO4)。砷在常温下缓慢氧化，加热时迅速燃烧成三氧化二砷(As2O3)，又名亚砷酐，俗称砒霜、砒石、
Arsenic (Arsenic, As) First, the physical and chemical properties Arsenic ash, yellow, black three allotropes, brittle and hard, with a metallic. Atomic weight 74.9, melting point 818 ℃, boiling point 615 ℃, sublimation. Do not dissolve in water, soluble in nitric acid and aqua regia, generating arsenic acid (H3AsO4). Arsenic at room temperature slowly oxidized, rapidly heated into arsenic trioxide (As2O3), also known as arsenic trioxide, commonly known as arsenic, stone,