The element lead consists of four naturally occurring isotopes with atomic masses 203.97302,  205.97444, 206.97587 and 207.97663 u. The relative abundance of these four isotopes are 1.400,  24.10, 22.10 and 52.40 % respectively. From these data, calculate the atomic weight of lead.

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.