Correct statement about the properties of the atom explained by the Thomson
model of an atom is:

1.  Overall neutrality of atom
2.  Spectra of a hydrogen atom
3.  Position of electrons, protons, and neutrons in an atom
4.  Stability of atom

Hint: Atom is neutral

J J Thomson, in 1898, proposed the plum pudding, (raisin pudding or watermelon) model of an atom. An important feature

of this model is that the mass of the atom is assumed to be uniformly distributed over the atom. This model was able to explain the overall neutrality of the atom.

Hence, option first is the correct option.