When a radioactive isotope decays by electron capture, the electron

Answer;

-Combines with a proton in the nucleus; the atomic number of the daughter is one less than the parent.

When a radioactive isotope decays by electron capture, the electron combines with a proton in the nucleus; the atomic number of the daughter is one less than the parent.

Explanation;

-Electron capture is one form of radioactivity. A parent nucleus may capture one of its orbital electrons and emit a neutrino.

-This is a process which competes with positron emission and has the same effect on the atomic number. Most commonly, it is a K-shell electron which is captured, and this is referred to as K-capture.The capture of the electron by a proton in the nucleus is accompanied by the emission of a neutrino.

im pretty sure its b