When a Radioactive Isotope Decays by Electron Capture,the Electron ________

Multiple Choice

When a radioactive isotope decays by electron capture,the electron ________.

A) combines with a neutron in the nucleus,raising the mass number of the daughter isotope by one
B) combines with a proton in the nucleus; the atomic number of the daughter is one less than the parent
C) makes the parent isotope into an ion with a charge of negative one
D) makes the daughter isotope into an ion with a charge of positive one