Are atoms the smallest indivisible particles? Class 9

Are atoms the smallest indivisible particles? Class 9

Think It Over (Page 140)

Question 1.

Are atoms the smallest indivisible particles? Class 9

Answer:

No, atoms are not the smallest indivisible particles. They are made up of smaller subatomic particles such as electrons, protons, and neutrons.

Question 2.

Why do electrons not fall into the nucleus even though they are attracted to protons in it? Class 9

Answer:

Electrons revolve around the nucleus in fixed energy levels (shells). In these stable orbits, they do not lose energy, so they do not fall into the nucleus.

Question 3.

Why did scientists keep modifying atomic models? Class 9

Answer:

Scientists kept modifying atomic models because new experiments and discoveries revealed limitations in earlier models. To better explain the structure of the atom and experimental observations, improved models were proposed.