Question

what do you understand by the watermelon model of an atom.who gave it?

Answer 1

thomson proposed that an atom consists of a uniform sphere of positive charge in which the electron are distributed more or less uniformly

this model is know as plum pudding model or raisin pudding or water melon model

Answer 2

The Plum Pudding Model is a model of atomic structure proposed by J.J. ... Thomson had discovered that atoms are composite objects, made of pieces with positive and negative charge, and that the negatively charged electrons within the atom were very small compared to the entire atom.

J. J. Thomson