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Define relative atomic mass....

Define relative atomic mass.

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The relative atomic mass of element mass of element is defined as the ratio of mass of one atom of the element to the mass of `1//12^(th)` mass of one atom of carbon -12 Relative atomic mass `(A_r)`
`=("Mass of one atom of the element")/("Mass of "1//12^(th) " mass of one atom of Carbon-12")`
`=("Mass of one atom of the element")/(1.6605xx10^-27 Kg)`
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The stable isotope of carbon (C-12) with atomic mass 12 is used as the standard for measuring the relative atomic mass of an element.

The stable isotope of …………….is used as the standard for measuring the relative atomic mass of an element.

Knowledge Check

  • Which one of the following element is used as the standard for measuring the relative atomic mass of an element in now a days?

    A
    `""_(1)H^(2)`
    B
    `""_(6)O^(12)`
    C
    `C-12`
    D
    `C-14`

  • The relative atomic mass of magneiusm based on C-12 scale is …………………. .

    A
    24 g
    B
    24
    C
    24 amu
    D
    24 kg

  • The relative atomic masses of many elements are not whole number because

    A
    they are not determined accurately
    B
    they exist as isotopes
    C
    due to impurities
    D
    atoms ionize

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