To be more specific, you can turn a proton into a neutron by electron capture or beta+ decay, but that&#x27;s not what a neutron <i>is</i>.<p>A neutron is 2 down (-1&#x2F;3 charge) quarks and 1 up (+2&#x2F;3 charge) quark, whereas a proton is 2 up and 1 down quark.  Electron (-1 charge) capture changes an up to a down and emits an electron neutrino (0 charge).<p>Beta decay is when a neutron changes to a proton and emits an electron and an electron antineutrino (beta-), or when a proton changes to a neutron and emits a positron and electron neutrino (beta+).<p>Even if you wanted to be generous, the grandparent post left out the electron antineutrino.