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

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

Name the scientist who discovered electron.

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.

Name the central part of an atom where protons and neutrons are held together.