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  4. The first model of atom in 1898 was proposed by

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Q. The first model of atom in $1898$ was proposed by

Atoms

Solution:

Sir J. J. Thomson proposed the first model of atom called plum pudding model of atom. According to this model, the positive charge of the atom is uniformly distributed throughout the volume of the atom and the negatively charged electrons are embedded in it like seeds in a watermelon.