The scattering of a stream of positively charged particles when striking a thin film of gold confirms thatthe positive charge in an atom must be located in a dense central mass.

atoms contain electrons in varying energy layers around the nucleus.

electrons are found in the center of an atom.

electrons can only be found within predicted areas surrounding the nucleus.

The correct statement is the positive charge in an atom must be located in a dense central mass.

Explanation:

Rutherford gave an experiment called as gold foil experiment.

In his experiment, he took a gold foil and bombarded it with alpha particles which carry positive charge of +2 units. He at first thought that the particles will pass straight through the foil, but to his surprise, many of them passed through, some of them deflected their path and a few of them bounced back straight from their path.

From this observations, he concluded that in an atom, there exist a small positive charge that is present at the center. Because of this positive charge, the alpha particles deflected their path and some of them bounced straight back their path.

Thus, the correct statement is the positive charge in an atom must be located in a dense central mass.

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

the answer is b

explanation: