What is difference between molecule , atom and mole
What is meant by mole and molecular mass
Answer the following questions.
(a) What is the difference between the models of the atom proposed by Thomson and by Rutherford?
(b) What is the characteristic property of the element hydrogen?
(c) What is meant by valency?
(d) What is meant by atomic mass number?
(e) Name the fundamental particles in an atom.
