The experiments conducted by j. j thompson improved on the accuracy of the atomic model. what did his experiments lead him to conclude?
he concluded that most of the atom was empty space.
he concluded that there was a nucleus at the center of the atom.
he concluded that an atom was made up of smaller particles called electrons in a sea of positive charges.
he concluded that electrons orbit the nucleus.
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He concluded that an atom was made up of smaller particles called electrons in a sea of positive charges.

Explanation:

The atomic model presented by Thomson is said to have a positive region in which the electrons are embedded. Thomson's experiment gave the charge to mass ratio of the electron correctly and was able to prove that hydrogen is not the smallest  matter existing. He proposed a model which has the famous name plum pudding model.

The plum cake is the region of positive charge in which electrons are compared to the raisins in it.

Rutherford's  gold foil experiment successfully proposed a new model that disproved Thomson's plum pudding model of the atom.

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explanation:

its math

uranium fissions/breaks up giving out energy and neutrons