Isotopes are different varieties of the same element, which have identical chemical properties but differ in atomic weight.
同位素是同一元素的不同种类，它们有着相同的化学特性但是原子重量不同。
Periodic table (1869) : Organized array of all the chemical elements in approximately increasing order of their atomic weight.
周期表(1869)：所有的化学元素按它们的原子量逐渐增加的顺序有组织地排列。
Periodic table (1869) : Organized array of all the chemical elements in approximately increasing order of their atomic weight.
周期表(1869)：所有的化学元素按它们的原子量逐渐增加的顺序有组织地排列。
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