Three different atoms of hydrogen are represented as ${}_1{}^1\mathrm{H};{}_1{}^2\mathrm{H};{}_1{}^3\mathrm{H}$. Draw atomic structure of ${}_1{}^3\mathrm{H}$.

• Atom is represented with its symbol having an atomic number in subscript and mass number in superscript. Symbolic representation is mentioned below :

• The atomic number $\left(\mathrm{Z}\right)$ of an element is equal to the total number of protons present in the nucleus of the atom.
• $\mathrm{Atomic}\mathrm{number}=\mathrm{number}\mathrm{of}\mathrm{protons}=\mathrm{number}\mathrm{of}\mathrm{electrons}(\mathrm{for}\mathrm{electrically}\mathrm{neutral}\mathrm{atom})$
• The atom ${}_1{}^3\mathrm{H}$will have one proton and one electron.
• The mass number of elements is equal to the sum of the total number of protons and neutrons present in the nucleus of the atom.
• $\mathrm{Mass}\mathrm{number}=\mathrm{number}\mathrm{of}\mathrm{protons}+\mathrm{number}\mathrm{of}\mathrm{neutrons}$
• Hence, ${}_1{}^3\mathrm{H}$will have $2$neutrons. The atomic structure is made by electrons