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Atoms and Atomic Mass Questions in English
Class 9 Science · ATOMS AND MOLECULES · Atoms and Atomic Mass
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State whether the following statement is true or false:
The relative atomic masses of all elements have been found with respect to an atom of oxygen-$16$.
The relative atomic masses of all elements have been found with respect to an atom of oxygen-$16$.
Solution
(FALSE) The statement is False.
Historically,oxygen-$16$ was used as a reference standard for atomic mass,but it was replaced by carbon-$12$ in $1961$. Currently,the relative atomic mass of an element is defined as the average mass of the atoms of the element compared to $1/12$th the mass of a carbon-$12$ atom.
Historically,oxygen-$16$ was used as a reference standard for atomic mass,but it was replaced by carbon-$12$ in $1961$. Currently,the relative atomic mass of an element is defined as the average mass of the atoms of the element compared to $1/12$th the mass of a carbon-$12$ atom.
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