There is no such word as radionic in English. Nigerians normally use this word to refer to someone repairing their home appliances. Instead of saying radionic, the apt word is technician.
Electronics means technology of electronic devices: the branch of technology concerned with the design, manufacture, and maintenance of electronic devices (takes a singular verb)
However, there is radionics: use of electronic diagnostic device: the use in alternative medicine of an electronic device that can detect vitamin and mineral deficiencies from a hair sample or can detect subtle energy changes in the body.