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4 September, 18:14

When potassium-40 undergoes decay by electron capture the product is?

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  1. 4 September, 18:57
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    Electron capture decay is a decay process. In this process electron is captured and a proton is converted into a neutron. Hence, mass number remains same but atomic number is lowering by 1 in daughter atom.

    K has atomic number 19. Hence daughter atom should have 1 9 - 1 = 18 as the atomic number. Hence, produced particle is Ar. but the mass number of Ar remains as same as 40.

    The equation is,

    ₁₉⁴⁰K + ₋₁⁰e → ₁₈⁴⁰Ar
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