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Class : 8

Subject : Science

Unit : 9.00 Lesson :Matter

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1.) What is 2n2 rule of Bohr and Bury?

2.) What is octet rule? Define duplet rule.

3.) What is an element?

4.) What is a compound?

5.) What is an atom?

6.) What is amu?

7.) What is coulomb?

8.) What is an electron?

9.) What is the mass of an electron?

10.) What is a proton?

11.) What is the mass of a proton?

12.) Proton carries unit charge. Explain.

13.) What is a neutron?

14.) What is the mass of a neutron?

15.) What is a nucleus?

16.) What is atomic number?

17.) What is atomic mass?

18.) Why is an atom electrically neutral?

19.) What is molecular weight?

20.) What is periodic table?

21.) What is the application of periodic table?

22.) What is mendeleev's periodic table based on?

23.) What is modern periodic table based on?

24.) What is modern periodic table?

25.) Description of the long form of periodic table:

26.) What are the advantages of modern periodic table?

27.) What is electronic configuration?

28.) What is valency?

29.) What is valence shell?

30.) What is duplet and octet?

31.) What is octet?

32.) What is reactive elements?

33.) Why neon is said an inert gas?

34.) Why the valency of oxygen is said to be two?

35.) What are alkali metals?

36.) Why chlorine is said reactive non metals?

37.) What is skeletal equation?

38.) What is balanced equation?

39.) What are the characteristics of Groups?

40.) What are the Properties of Period?

41.) What is physical change?

42.) What is chemical change?

43.) What is chemical reaction?

44.) What is molecular formula?

45.) What is molecular formula of an element?

46.) What is molecular formula of a compound?

47.) What is a chemical reaction?

48.) What are reactants?

49.) What are products?

50.) What is word equation?

51.) What is formula equation?

52.) What are the steps of writing chemical reaction?

53.) Differentiate between: (a) Proton and electron (b) K shell and M shell (c) Valence shell and valence electron (d) Atomic weight and molecular weight

54.) Give reasons: (a) An atom is electrically neutral. (b) The valency of Chlorine is 1.

55.) Answer the following questions: (a) What is an atom? (b) Write the name , symbol and charge of sub-atomic particles in an atom. (c) Write the molecular formu la of the given compound by the crisscross method. (i) Magnesium oxide (iii) Potassium oxide (v)

56.) (m) Can an atom exist without electrons? Give reasons.

57.) 2. Differentiate between: (a) Group and period (b) Metals and non-metals (c) Group 1 and Group 17 elements (d) Word equation and formula equation (e) Reactants and products

58.) Give reason: (a) Classification of elements is necessary. (b) Sodium and Chlorine be long to different groups but they have valency 1. (c) The study of elements becomes easier using a periodic table. (d) The products are different from the reactants. (e)

59.) Answer the following questions: (a) What is periodic table? (b) Write the modern periodic law. (c) Explain the position of metals in the modern periodic table. (d) What change in the nietallic properties of the elements occurs w hile moving from top to bo

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