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Fundamental particles of an atom - class-XI
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An αα particle is:
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A
a helium nucleus
💡 Explanation:
$(B)$ a helium nucleus
$Reason$ : An $\alpha$ particle is a positively charged particle consists of two protons and two neutrons , all held together by the same strong nuclear force that binds the nucleus of any atom , emitted by some radioactive substances and identical to the nucleus of helium atom . It carry a charge of $+2$.