The element X has two naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given in the table below. The average atomic mass of the element is amu. Isotope | Abundance (%) | Mass (amu) 31x 35.16 31.16 34x 6484 3430 O 35.22 O 30.20 O 32.73 O 33.20 О 34.02

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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.