When promethium-165 atomic number 61 undergoes beta decay it transmutates into?

When promethium-165 (Pm-165), which has an atomic number of 61, undergoes beta decay, it transmutates into neodymium-165 (Nd-165), which has an atomic number of 60. In this process, a neutron in the promethium nucleus is converted into a proton, emitting a beta particle (an electron) and an antineutrino. This results in an increase in the atomic number by one, changing the element to neodymium while the mass number remains the same.