Question

Write balanced nuclear equation for the decay of strontium 94 into yttrium

Answer 1

The nuclear decay equation is $_{38}^{94}Sr \rightarrow _{39}^{94}Y + e^- + \overline{\nu}$

Explanation:

First of  all, we look at the periodic table to see what is the atomic number of the two elements involved.

We notice that:

• The atomic number of strontium is 38
• The atomic number of yttrium is 39

This means that in the decay, a neutron from the nucleus of strontium transforms into a proton (because the atomic number, which is the number of protons, increases by 1 unit).

Therefore, this means that the decay involved is a beta-minus decay, in which a neutron converts into a proton emitting an electron (to conserve the charge) alongside an anti-neutrino.

Therefore, the balanced nuclear decay equation is:

$_{38}^{94}Sr \rightarrow _{39}^{94}Y + e^- + \overline{\nu}$

where the mass number (94) does not change, since the number of nucleons (protons+neutrons) remains the same.

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