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

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.

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.