Properties of the following are:
Alpha particle - positively charged particle (+) that consists of two electrons and two neutrons.
Cathode rays - it is the stream of electrons (negatively charged) found in vacuum.
Protons - are particles that carry positive charge and is present inside the nucleus of an atom.
Electrons - are particles that carry negative charge and is present in the orbits of the atom.
Neutrons - electrically neutral particle (0 charge) present inside the nucleus of an atom. However, it has its own mass.
His observation and census.
Mass, if you know what element you are working with.
