explain with example 1.atomic number 2.mass number
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i) Atomic number is the total number of protons present in the nucleus of an atom. It is also equal to the number of electrons for a neutral atom. Example, atomic number of sodium is 11.
ii) Mass number is the number of protons and neutrons in the nucleus taken together. For example, mass number of sodium is 23 g/mol.
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Mass number is always an integer.
The atomic mass reported on a periodic table is the weighted average of all the naturally occuring isotopes.
Being an average it would be most unlikely to be a whole number.
The mass of an individual atom in atomic mass units is the mass relative to carbon-12.
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