论文部分内容阅读
氧元素符号O,原子序数8,原子量16.00,属周期系ⅥA族,熔点54.8K(—218℃),沸点90.2K(—183℃),密度0.0014克/立方厘米。大气中21%(以体积计)为氧,水中含氧89%,地壳中含氧为49%,这些确定了氧是重要元素的地位。早在公元4世纪,就有关于氧的记载:“把铜精灵和水银揉和在一起,就能释放出气体状的物体。”即当一化合物在水银上加热时,就可观察到气体(氧气)的
The oxygen element symbol O, atomic number 8, atomic weight 16.00, belongs to the group VIA of the periodic system, has a melting point of 54.8 K (-218° C.), has a boiling point of 90.2 K (-183° C.), and has a density of 0.0014 g/cm 3. In the atmosphere, 21% (by volume) of oxygen, 89% of oxygen in water, and 49% of oxygen in the earth’s crust, confirm that oxygen is an important element. As early as the 4th century AD, there was a record of oxygen: “Kneading a copper elf with mercury will release a gas-like object.” That is, when a compound is heated on mercury, it can be observed. Gas (oxygen)