What is located outside the electron of the nucleus?
All electrons are located outside the nucleus, the nucleus only holding protons and neutrons.
Electrons are located outside the nucleus revolving around. These electrons may be named as Chemistry electrons. But when neutron within the nucleus decay, then proton and electron are produced. This electron was not already there in the nucleus. But only due to decay of neutron electron comes out. This electron may be named as Physics electron. This electron comes out at very speed and this is sensed as beta particle, named by Henry Becquerel.