Draw the geometric atomic structure of ${}_{2}^{4}{He}$ , showing clearly number of neutrons, number of protons and number of electrons.

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Solution

The subscript denotes the atomic number .Thus helium is having atomic number 2.
Atomic number is the number of protons in an atom, hence number of protons=2.
In an electrically neutral atom, number of electrons and protons will be same. Hence number of electrons=2.
Superscript denotes mass number. Mass number is the sum of number of protons and neutrons.
Hence number of neutrons=mass number-number of protons=(4-2)=4.

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Draw the geometric atomic structure of ${}_{2}^{4}{He}$ , showing clearly number of neutrons, number of protons and number of electrons.