Question

Scientists have changed the model of the atom as they have gathered new evidence. One of the atomic models is shown below. Overlapping red and blue balls in the center with a circular fuzzy green cloud outside them. What experimental evidence led to the development of this atomic model from the one before it? A few of the positive particles aimed at a gold foil seemed to bounce back off of the thin metallic foil. Experiments with water vapor showed that elements combine in specific proportions. Equations were used to identify regions around the nucleus where electrons would likely be. Cathode rays were bent in the same way whenever a magnet was brought near them.

Answer 1

Answer:

A). A few of the positive particles aimed at a gold foil seemed to bounce back off of the thin metallic foil.

Explanation:

Scientists decided to change the model of the atom when they discovered new evidence that showed 'few of the positive particles aimed at a gold foil seemed to bounce back off of the thin metallic foil.' On this ground, Rutherford concluded that atom is mostly made up of empty space and thus, he proposed a nucleus model of atom in which the atom comprises of the tiny and positively charged nucleus is surrounded by electrons with a negative charge. Thus, option A is the correct answer.

Answer 2

Answer: C. Equations were used to identify regions around the nucleus where electrons would likely be.