The introduction of matter wave concept by de Broglie, the principle of uncertainty by Heisenberg etc., paved the way for modern atomic theory
MODERN ATOMIC THEORY - Modern atomic theory are as follows.
v Atom is considered to be a divisible particle.
v Atoms of the same element may not be similar in all respects. eg: Isotopes (17Cl35,17Cl37 )
v Atoms of different elements may be similar in some respects eg. Isobars (18Ar 40 , 20Ca 40 )
v Atom is the smallest particle which takes part in chemical reactions.
v The ratio of atoms in a molecule may be fi xed and integral but may not be simple e.g., C12H22O11 is not a simple ratio (Sucrose)
v Atoms of one element can be changed into atoms of other element by transmutation.
v The mass of an atom can be converted into energy. This is in accordance with Einstein’s equation E = mc2