1. Who proposed the Atomic Theory in 1808?
2. The smallest unit of an element that retains its chemical properties is called?
3. A molecule is formed when?
4. The chemical formula of water is?
5. Which of the following is a molecule of an element?
7. The SI unit of amount of substance is?
8. Which particle carries a negative charge?
9. Which subatomic particle has no charge?
10. The center of an atom is called?
11. Atoms of the same element having different mass numbers are called?
12. The number of protons in an atom is known as?
13. The mass number of an atom is equal to?
14. Which of the following is a compound?
15. The combining capacity of an atom is called?
16. Which gas is represented by the formula CO₂?
17. The formula of ammonia is?
18. Which element has atomic number 1?
19. Which particles determine the chemical properties of an atom?
20. Matter is made up of tiny particles called?
