Name the scientist who discovered electron.

Name the three subatomic particles present in an atom.

Name the negatively charged particle present in the atoms of all the elements.

What is the usual symbol for (a) an electron (b) a proton, and (c) a neutron?

State whether the following statements are true or false:

(a) Thomson proposed that the nucleus of an atom contains protons and neutrons.

(b) The cathode rays obtained from all the gases consist of negatively charged particles called electrons.

(c) The anode rays obtained from all the gases consist of positively charged particles called protons.