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# What is meant byA.Atomic number of an element. B.Mass number of an element.Explain with the help of an example.

Last updated date: 14th Jul 2024
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Hint: We know that in order to answer this question, one must have a clear idea about the structure of the atom and the various parameters related to it. An atom of any element has a fixed atomic number and mass number.

Atomic number: The atomic number is the total number of protons present in the atom. For example, the total no. of protons in a carbon atom is $6$, so its atomic no. is $6.$ Also, one atom of $Na$ contains $11$ protons and $12$ neutrons, so its mass no. is $23.$
Mass number: It is the sum of the number of neutrons and the number of protons. For example, the atomic number of Lithium is $4$ which is equal to the number of protons; the number of neutrons of magnesium is $4.$ The mass number is equal to $8\left( 4+4 \right).$