Give a brief account of the development of the presently accepted model of atom with the contributions made by different scientists. Write two features of this atomic model


#1

Thomson model : He proposed that atom is sphere of positive charge having negatively charge embedded in it. The amounts of positive and negative charges on the atom are equal.
Rutherford’s model : He proposed that atom has a central positively charged nucleus which possesses entire mass of the atom and is very small in comparison to the size of the atom. The electrons revolve around the nucleus in definite circular path.
Bohr’s model :
(i) Atom has central positively charged nucleus with the entire mass concentrated in it.
(ii) Electrons revolve around the nucleus in well defined circular orbits known as discrete orbits of electrons.
(iii) While revolving in these orbits electrons do not radiate energy.