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Atomic number is sum of protons and neutrons in an atom

Atomic weight of an element is a whole number

Empirical formula of a compound shows the relative number of atoms of each element

Atomic mass unit is 1/12 of the mass of one atom of a particular isotope of Oxygen(O-18)

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Explanation:

The atomic mass is not given as a whole number because it is a weighted average taken of all of an atom's isotopes found in nature relative to the mass of carbon-12. An element's mass number (A) is the sum of thenumber of protons and the number of neutrons.