Helium atom:
He has atomic number 2. It belongs to noble gas.
Since its atomic number is 2, thus the number of protons will also be 2. As we know, The number of protons and the number of electrons are same in a neutral atom. Thus total number of electrons will also be 2.
Number of neutrons can be identified by differentiating Mass number with atomic number. Therefore, Number of neutrons will be 4-2=2.
Thus, it can concluded.
Number of protons=2
Number of electrons=2
Number of neutrons=2
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