_____________ gains two electrons in its valence shell forming an anion.
Oxygen
Chlorine
Nitrogen
Calcium
According to _______________ atomic theory atoms are neither created nor destroyed.
Boyle's
Charals's
Bohr's
Dalton's
_______________ discovered that cathode rays have kinetic energy and raise the temperature of a metallic object on which they fall.
Goldsteirn
William crooke
Sir J.J thomson
Rutherford
____________________ discovered cathode rays.
J J Thomson
Goldstein
_________________ discovered the positive rays emitted the anode.
Sir.J Thomson
________________ proposed a theory of atom known as the atomic theory.
Democritus
John Dalton
Joseph Priestly
__________________ discovered that cathode rays are deflected by magnetic and electric field.
Willam crooke
Sir.J J thomson
Gold stein
________________ is the electrons in its valence shell forming an anion.
_____________ gains three electron in its valence shell forming an anion with three negative charge.
Aluminium
_________________ discovered electrons
Mendeleev
Sir J.J Thomson