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In 1898, which scientist proposed that the atom is a sphere of positively charge...


Question

In 1898, which scientist proposed that the atom is a sphere of positively charged matter in which negatively charged electrons are embedded

Options

A) Earnest Rutherford

B) Max Planck

C) J.J Thomson

D) Robert Millikan


The correct answer is C.

Explanation:

In 1898, JJ Thomson proposed a structure for the atom which had a positively charges spheres (+) in which negatively charged electrons (-) were embedded.

Thomson knew that atoms had an overall neutral charge. Therefore, he reasoned that there must be a source of positive charge within the atom to counterbalance the negative charge on the electrons. This led Thomson to propose that atoms could be described as negative particles floating within a soup of diffuse positive charge. This model is often called the plum pudding model of the atom, due to the fact that its description is very similar to plum pudding, a popular English dessert (see image below)

Thomson's Plum Pudding


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Discussion (3)

  • The answer is A.
    It was Rutherford

    Reply
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  • In 1898, JJ Thomson proposed a structure for the atom which had a positively charges spheres (+) in which negatively charged electrons (-) were embedded.

    Thomson knew that atoms had an overall neutral charge. Therefore, he reasoned that there must be a source of positive charge within the atom to counterbalance the negative charge on the electrons. This led Thomson to propose that atoms could be described as negative particles floating within a soup of diffuse positive charge. This model is often called the plum pudding model of the atom, due to the fact that its description is very similar to plum pudding, a popular English dessert (see image below)

    Thomson's Plum Pudding

  • IT SHOULD BE B.