The yttrium- nuclide radioactively decays by electron capture. Write a balanced nuclear chemical equation that describes this process.

See explanation and image attached

Explanation:

Yttrium has many isotopes, the lowest mass number of Yttrium  is 89Y.

Recall that electron capture converts an electron into a proton and then into a neutron with a consequent emission of a neutrino (v).

In electron capture, the mass number of the daughter nucleus remains the same as that of the parent nucleus while the atomic number of the daughter nucleus is less than that of the parent by one unit.

you need to have a picture of the atom that way we can answer it

it was spontaneous.

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