Question

who proposed the law of definite proportions?
○ crookes
○ thomson
○ proust
○ rutherford

1. choose the best answer.

who discovered the nucleus?
○ crookes
○ thomson
○ proust
○ rutherford

Explanation:

First Question (Who proposed the law of definite proportions?):

The law of definite proportions (also known as Proust's law) was proposed by Joseph Proust. Crookes is known for work with cathode rays and elements, Thomson discovered the electron, and Rutherford discovered the nucleus (relevant to the second question). So the correct option is Proust.

Ernest Rutherford discovered the atomic nucleus through his gold foil experiment. Crookes worked with cathode tubes, Thomson discovered the electron, and Proust proposed the law of definite proportions. So the correct option is Rutherford.

Answer:

C. Proust

Second Question (Who discovered the nucleus?):