_______________ is the positively charged particles in an atom.

According to _______________ atomic theory,matter consists of small indivisible particles called atoms.

_____________________ is the electronic configuration of nitrogen atom.

_________________ discovered the positive rays emitted the anode.

______________ was an ancient greeck philosopher studied the nature of the matter and the basic constituents of all substance.

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

Uranium has ________________ isotopes.

_____________ gains two electrons in its valence shell forming an anion.

_________________ discovered electrons

________________ proposed a theory of atom known as the atomic theory.