1.

Define Relative atomic mass.

Answer»

Solution :Relative ATOMIC MASS of an element is the ratio between the average mass of its isotopes to `1//12^("th")` PART of the mass of a CARBON - 12 atom. It is denoted as `A_(r)`.
`"Relative atomic mass"=("Average mass of the isotopes of the element")/(1//12^("th")" of the mass of ONE Carbon - 12 atom")`


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