Potassium has ______________ isotopes

_________________ discovered electrons

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

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

________________ is the electrons in its valence shell forming an anion.

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

Oxygen has_________ isotopes.

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

__________________ discovered that cathode rays are deflected by magnetic and electric field.

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