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Mass Number and Representation of Atom

An alpha-part...

Question

An alpha-particle has how many neutrons?

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Solution

Alpha-particle:
It is a helium atom emitted by radioactive substances.
Its atomic number is 2 and its atomic mass is 4. It is represented as ${}_{2}^{4}H e$ .
It consists of 2 neutrons and 2 protons.
Hence, an alpha particle has 2 neutrons.

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Mass Number and Representation of Atom

Standard IX Chemistry

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