How many neutrons are contained in a neutral atom of an element with an atomic number of 30 and an atomic mass of 65.38?

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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i believe the answer is a.

what is the question here. i think you messed up.

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