What are the postulates of Thomson's model of atom?

Explanation

J.J. Thomson proposed a model of atom in 1898. The main postulates are
1) An atom is considered to be a sphere of uniform positive charge and electrons are embedded into it.
2) The total mass of the atom is considered to be uniformly distributed throughout the atom.
3) The negative and the positive charges are supposed to cancel out the atom as a whole is electrically neutral.
This model is commonly known as plum pudding model or watermelon model.