Class 9 · Science · Exploration

8. Journey Inside the Atom

Try question 1

The electron was discovered by

Tap an answer to check.

Answer and explanation

Answer: A. J. J. Thomson

Thomson found electrons using cathode rays.

Open this question →

Try question 2

The neutron was discovered by

Tap an answer to check.

Answer and explanation

Answer: B. James Chadwick

Chadwick discovered the neutron in 1932.

Open this question →

Try question 3

The maximum number of electrons in the first shell (K) is

Tap an answer to check.

Answer and explanation

Answer: A. 2

2n² with n = 1 gives 2.

Open this question →