Name the particle ${}_{12}^{24}{Mg}$ , stating clearly the meaning of the numbers represented in superscript or subscript.

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Solution

A subscript or a superscript is a character that is set slightly below and above the normal line of type respectively.
Given magnesium atom.
The subscripts represents the atomic number.
Atomic number is the number of protons in an atom.Here the atomic number is given as 12 and hence there are 12 protons in a magnesium atom.
The superscript represents the mass number.
Mass number is the sum of number of protons and neutrons in an atom.
Here the mass number of magnesium atom is given as 24.
Hence there will be (24-12)=12 neutrons.

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