How Dalton's atomic theory was modified on the basis of modern reseraches? or Give various postulates of modern atomic theory.

What do you understand by atom and molecule?

What is the difference between molecule of an element and molecule of a compound?

Define Avogadro’s law. Taking a suitable example, prove that it is not in contradiction with Dalton’s atomic theory.

Explain breifly the present state of Atomic-Molecular theory of matter.

Define the following:
Precision and accuracy

Define the following:
Unit factor

Define the following:

Average atomic mean.

What do you understand by:
(i) Atomic Mass?
(ii) Gram atomic mass(gram-atom)?

140.

Calculate the atomic mass(average) of chlorine using the following data:

	%Natural Abundance	Molar mass
35Cl	75·77	34·9689
37Cl	24·23	36·9659