Which of the following is the symbol of the unit of atomic mass?
u
The correct answer is option 4 i.e. u.
The symbol “u” stands for atomic mass unit (amu) or unified mass unit, which is the standard unit used to express atomic and molecular masses. One atomic mass unit is defined as 1/12th the mass of one carbon-12 atom, and it is approximately equal to 1.66 × 10⁻²⁷ kg.
Other Options Explained:
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mg (milligram): A unit of mass in the metric system; too large for atomic measurements.
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g (gram): Also too large to measure atomic-scale masses.
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ml (millilitre): A unit of volume, not mass.
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