Question

what is meant by untid atomic mass​

Answer 1

Answer:

Unified mass (u) refers to atomic mass unit (abbreviated as amu). It is defined as 1/12 the mass of an atom of carbon-12. According to latest IUPAC guidelines, we use the symbol u instead of amu to represent masses of atoms.

Explanation:

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Answer 2

• The mass of an atom is called the atomic mass (ma or m).
• Although the kilogramme (symbol: kg) is the SI unit of mass, atomic mass is commonly stated in non-SI units such as the atomic mass unit (amu), unified mass (u), or dalton (symbol: Da), where 1 amu, 1 u, or 1 Da is defined as 1/12 of the mass of a single carbon-12 atom at rest.  
• The nucleus' protons and neutrons make up nearly all of an atom's total mass, with electrons and nuclear binding energy contributing only a small amount.
• As a result, when expressed in daltons, the numeric value of the atomic mass is almost identical to the mass number.
• The atomic mass constant may be used to convert weight in kilogrammes to weight in daltons.