_______________ discovered that cathode rays have kinetic energy and raise the temperature of a metallic object on which they fall.

According to _______________ atomic theory atoms consisting of subatomic particles like electrons ,protons and neutrons.

Uranium has ________________ isotopes.

Carbon has ________________ isotopes.

Oxygen has_________ isotopes.

_____________ gains three electron in its valence shell forming an anion with three negative charge.

_______________ loses two electrons from its valence shell forming a cation.

_________________ discovered the positive rays emitted the anode.

According to ______________ atomic theory an atom is the smallest unit of matter which takes part in a chemical reaction

According to _______________ atomic theory atoms are neither created nor destroyed.