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Theory
Practice Questions
1. 
Discovery of structure of the atom
Difficulty: easy 
2

2. 
Discovery of subatomic particles
Difficulty: easy 
3

3. 
Atomic number
Difficulty: easy 
3

4. 
Subatomic particle
Difficulty: easy 
3

5. 
Thomson and Rutherford models
Difficulty: easy 
3

6. 
Atomic masses calculation
Difficulty: easy 
3

7. 
Atoms and subatomic particles
Difficulty: medium 
3

8. 
Bohr's atomic model
Difficulty: medium 
3

9. 
Calculate the number of electrons and protons I
Difficulty: medium 
2

10. 
Calculate the number of electrons and protons II
Difficulty: medium 
3

11. 
Subatomic particles
Difficulty: medium 
3

12. 
Electronic configuration of elements
Difficulty: medium 
2

13. 
Find the number of electrons in ions
Difficulty: medium 
4

14. 
Gain and loss of electron(s)
Difficulty: hard 
2

15. 
Isotopes and isobars
Difficulty: hard 
2

16. 
Electron distribution in elements
Difficulty: hard 
6

17. 
Valency of elements or atoms
Difficulty: hard 
6
