From the symbol ${}_{2}^{4}{He}$ for the element helium, write down the mass number and the atomic number of the element.

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Solution

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 $(Z)$ of an element is equal to the total number of protons present in the nucleus of the atom. From symbolic representation, it is clear that helium has an atomic number $2$ .
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. From symbolic representation, helium has a mass number $4$ .

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