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Question

Why is the atomic mass of the sodium atom "23 amu"?


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Solution

Atomic mass:

  • The atomic mass is the mass of an atom.
  • The SI unit of atomic mass is the unified atomic mass unit.
  • One unified atomic mass unit is defined as 112th part of the mass of a single carbon-12 atom which is assigned a mass of 12 a.m.u.

Atomic mass of the sodium:

  • Sodium Na is an alkali metal that appears first in the periodic table's third period
  • Atomic mass is the sum of the total number of protons and the total number of neutrons in an atom.
  • The nucleus of a sodium atom has 11 protons and 12 neutrons.
  • The atomic mass of sodium is as follows:

Atomicmass=Numberofprotons+Numberofneutrons=11+23=23

  • Since Na has an atomic mass of 23, its atomic mass is 23amu.

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