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Class : 9

Subject : Science

Unit : 14.00 Lesson :Atomic Structure and Chemical Bonds

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1.) Differentiate between nuclear fission and nuclear fusion.

2.) Differentiate between cation and anion.

3.) Differentiate between duplet and octet.

4.) What is valency?

5.) Write the valency of aluminium and nitrate in Al (NO).

6.) How many electron pairs are shared by an oxygen molecule?

7.) The valency of fluorine is 1. What is its valence electron?

8.) What is an element?

9.) What is a compound?

10.) What is a covalent compound?

11.) Write the subatomic particles of an atom.

12.) Write any two electrovalent compounds.

13.) What is meant by atomic mass of sodium is 23?

14.) In two atoms, atom X loses two electrons and atom Y gains these two electrons to from a molecule XY. Write any two properties of the compound XY.

15.) What do you understand by valence electrons and valence shell?

16.) Justify the statement "Nuclear energy is harmful as swell as useful".

17.) What is an electrovalent bond? Also give an example.

18.) What is a covalent bond? How is it formed? Explain with an example.

19.) Explain the postulation of Neil Bohr's atomic model.

20.) Write the electronic configuration of sodium and chlorine.

21.) Define a molecular formula. What information is conveyed by a molecular formula?

22.) Explain the steps of writing a molecular formula.

23.) What are radioactive elements and radioactivity?

24.) A chlorine atom has an atomic mass of 35 and 17 protons in its nucleus. How many neutrons does it have?

25.) If K and L shells of an atom are full, then what would be the total number of electrons in the atom?

26.) How will you find the valency of fluorine, phosphorus and magnesium?

27.) Write the molecular formulae of the following compounds by crisscross method: Ammonium sulphate Zinc nitrate Sodium peroxide Carbon tetrachloride Sliver nitrate Ferric hydroxide Ammonium chloride Aluminum sulphate Mercuric oxide Calcium carbonate Potassiu

28.) Write the molecular formulae of the following compounds. Sodium oxide Cuprous oxide Mercuric oxide Calcium nitrate Aluminium oxide Ferric chloride Ammonium chloride Silver chloride Hydrogen bromide Magnesium nitride Hydrogen peroxide Sodium sulphate Ammo

29.) Calculate the molecular weight of the following compounds. Ammonium chloride Potassium bicarbonate Potassium chlorate Ammonium hydroxide Ammonia calcium carbonate Hydrochloric acid

30.) What is an element? Give two examples.

31.) What is a compound? Give two examples.

32.) What do you mean by electronic configuration?

33.) What are subatomic particles?

34.) Differentiate between Atom and molecule.

35.) Differences between proton and neutron

36.) Differences between neutron and electron

37.) The differences between proton and electron

38.) Element is a pure substance, why?

39.) Name any four metals, non-metals, metalloids and inert gases.

40.) Is compound formed by physical process or chemical process? Clarify your answer.

41.) Compound is a pure substance, why?

42.) Why is compound different from mixture?

43.) Distinguish between element and compound.

44.) Water is a compound, why?

45.) Name three compounds that we use daily.

46.) What is electronic configuration?

47.) What forms the shell or orbit?

48.) What do you mean by electropositive radicals? Give any three examples.

49.) Why do radicals contain charge?

50.) What are electronegative radicals? Give any four examples with their valencies.

51.) What are covalent compounds? Give two examples.

52.) What is electrovalent bond? Explain with an example.

53.) What is covalent bond? Give examples.

54.) What are valence electrons? Explain with examples.

55.) The valency of sodium is 1.

56.) The valency of argon is zero.

57.) Potassium chloride is called ionic compound.

58.) Carbon dioxide is called covalent compound.

59.) What is molecular formula? Give one example.

60.) Differences between chlorine atom and chlorine ion

61.) Differences between atom and ion

62.) What are the valencies of Na, Mg, C and Al in NaCl, MgCl2, CCL4 and AICI3, if the valency of chlorine is 1?

63.) Define cation and anion with examples.

64.) What is duplet state? Give one example.

65.) What is octet state? Give one example.

66.) What are noble gases? What is their valency? Why?

67.) What is bond? Distinguish between ionic bond and covalent bond.

68.) What do you mean by variable valency? Explain with examples.

69.) The differences between ionic compounds and covalent compound.

70.) The differences between sodium atom and sodium ion

71.) In the given molecular formula MgCl2, write the valency of magnesium and chlorine. What is an electrolyte?

72.) What is meant by molecular formula? What information do you get from it?

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