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Which of the following is the symbol of the unit of atomic mass?
g
kg
u
amu
g
The unified atomic mass unit, historically denoted as 'amu' or 'u', is standardly represented by the symbol 'u' (unified atomic mass unit) or 'Da' (Dalton) in modern chemistry and physics. It is defined as 1/12th of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state.
The unified atomic mass unit, historically denoted as 'amu' or 'u', is standardly represented by the symbol 'u' (unified atomic mass unit) or 'Da' (Dalton) in modern chemistry and physics. It is defined as 1/12th of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state.
Just as grams or kilograms are convenient for weighing everyday objects like fruits or grains, 'u' is a microscopic weighing scale designed specifically to measure the extremely tiny masses of individual atoms and molecules without dealing with unwieldy powers of 10.
Remember 'u' for 'unified' atomic mass unitтАФthe fundamental universal unit for atoms.
1┬аu=121тАЛ├Чmass┬аof┬аone┬а12C┬аatom
1┬аu=1.660539├Ч10тИТ27┬аkg
The unit 'u' provides a convenient way to express the masses of subatomic particles, atoms, and molecules. One unified atomic mass unit is approximately equal to 1.660539├Ч10тИТ27┬аkg, which is roughly the mass of a single proton or neutron.
The symbol 'u' stands for the unified atomic mass unit.
It replaced the older abbreviation 'amu' by international agreement (IUPAC).
It is also sometimes referred to as the Dalton (Da), named after John Dalton.
Used extensively in molecular weight calculations and stoichiometry.
Simplifies calculations involving microscopic atomic and molecular masses.
Avoids unwieldy powers of 10 when dealing with individual atoms.
Expressing atomic weights on the periodic table
Calculating molar masses and relative molecular masses in chemical equations
Option B (mg) represents milligram, which is 10тИТ3┬аg.
Option C (g) represents gram, the base metric unit of mass.
Option D (ml) represents milliliter, which is a unit of volume (10тИТ3┬аliters).
A is correct тАФ 'u' is the standard symbol for the unified atomic mass unit used to express atomic and molecular masses.
Always ensure you use 'u' instead of 'amu' in competitive chemistry exams as it aligns with modern IUPAC nomenclature standards.
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