4

Total Marks : 30

Total Time : 40 min

1.   What are nucleons?

(2 Marks)

2.   Give the electronic configuaration of Cl– ion.

(2 Marks)

3.   Draw the atomic structure of helium atom.

(3 Marks)

4.   What are isobars?

(2 Marks)

5.   What is mass number of an atom?

(2 Marks)

6.   Find the valency of 

(3 Marks)

7.   What are isotopes? Give its two applications.

(3 Marks)

8.   An atom is electrically neutral. How can it become charged?

(3 Marks)

9.   Explain Rutherford’s α-particle scattering experiment and give its observation and conclusion drawn.

(4 Marks)

10.   Give the difference between three sub-atomic particles.

(3 Marks)

11.   Give the names of three atomic species of hydrogen.

(3 Marks)