What is a balanced nuclear equation for the alpha decay of Strontium-90?

The balanced nuclear equation for the alpha decay of Sr-90 is

Explanation:

A nuclear reaction is defined as the reaction in which the changes in the nucleus of an atom take place and usually form a different element. The types of decay processes are:

Alpha decay is the process in which a heavy nucleus decays into a light nucleus with the release of an alpha particle. This alpha particle carries a charge of +2 units and has a mass of 4 units. It is also known as the helium nucleus. The general equation for this decay process is:

The nuclear equation for the alpha decay of strontium-90 isotope follows:

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the answer for sodium is 0.186

the answer for rubidium is 0.251