A radioactive nucleus at rest decays into a second nucleus, an electron, and a neutrino. The electron and..?

A radioactive nucleus at rest decays into a second nucleus, an electron, and a neutrino. The electron and neutrino are emitted at right angles and have momenta of 9.00 10-23 kg�m/s, and 5.80 10-23 kg�m/s, respectively. What is the magnitude and direction of the momentum of the second (recoiling) nucleus?