Question

The nucleus of an atom is dense and positively charged. What was observed when positively charged particles were radiated onto a gold atom during Rutherford's experiment because of this?
Negative charges were concentrated at the center of the atom.
Particles that struck the center of the atom were repelled.
Particles that struck the edges of the atom were repelled.
Positive charges were distributed all over the atom.

Answer 1

According to my knowledge, I feel the answer is -
Particles that struck the center of the atom were repelled.

Hope this helps!

Answer 2

Answer: The correct answer is particles that struck the center of the atom were repelled.

Explanation:

Rutherford gave an experiment which is known as gold foil experiment.

In his experiment, he took a gold foil and bombarded it with the alpha particles (carrying positive charge). These alpha particles are also known as  helium nucleus. It is represented as $_2^4\alpha$.

He thought that these particles will pass straight through the foil, but to his surprise, some of them deflected their path and a few of them bounced back.

From this he concluded that in an atom, a small positive charge in the center is present. Due to this positive charge, the alpha particles deflected their path and some of them bounced straight back from their path.

Hence, the correct answer is particles that struck the center of the atom were repelled.