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An alpha particle is also referred to as a nuclear us of which isotope

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The right answer is 4He2+

Alpha particle looks like the nucleus of helium, but without electrons.

Alpha particles or alpha rays are a form of radiation emitted by unstable nuclei of great atomic mass. They consist of two protons and two neutrons combined into a particle identical to the helium nucleus 4 (helium); they can therefore be written 4He2 +.

The mass of an alpha particle is 6.644657 × 10-27 kg, which equates to a mass energy of 3.72738 GeV.

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