Thomson's Model of Atom

J.J. Thomson, in 1898,proposed that an atom was a sphere of positive electricity in which electrons were embedded to neutalise the positive charge .The stability of the atom was explained as a result of the balance between the repulsive forces between the electrons and their attraction towards the center of the positive sphere. This model is compared as the water melon in which seeds were embedded or with a cake or pudding in which raisins (dried grapes/kishmish) are embedded.That is why this model is sometimes called raisin pudding model or water melon model.In this model mass of the atom is assumed to be uniformly distributed over the atom.