Chemistry - 9 Chapter - 4
Periodicity of Elements and Periodic Table
Test - 3

1. In 1894 Raleigh and Ramsay succeeded in separating a new gas from air and named it Krypton.


2. Oxides of metals are basic in nature.


3. The metals react vigorously with water producing oxygen gas


4. Aluminium reacts with dry chlorine at high temperature to form Aluminium Chloride whose solution in water is basic


5. 10 -14 part of a meter is called picometer (pm]


6. In Mendeleef's table blank spaces were left for radioactive elements


7. Groups number of an element represents the number of shells


8. Oxides of non-metals are acidic in nature


9. Sixth period contains 36 elements


10. Ionization energy decreases across a period


11. Dobereiner gave law of octaves


12. Lothar Mayer plotted a graph between atomic volume and atomic number


13. Gallium (Ga) is solid at room temperature


14. Unit of electron affinity is kJmol-1


15. Penultimate shells are outermost shells.


16. Our planet earth is composed of many elements combined together in the form of




17. No. of electrons in the valence shell of 5th group is:




18. Elements of VII A have following configuration in their outer shells:




19. When Aluminium reacts with oxygen on heating it forms a thin layer of aluminium oxide with formula




20. Formula of hypochlorous acid is




21. Nanometer (nm) is equal to




22. The physical and chemical properties of elements depend upon their




23. Colour of hair of different people differs due to the presence of:




24. The element which is not a transition element is:




25. Uranium has atomic mass:




26. Amphoteric oxide is:




27. The most reactive non-metal is




28. Number of elements in the 5th period of periodic table is




29. Select the two which are not a coinage metal




30. Lanthanide series starts from




31. Electrons revolve around the nucleus with Tremendous _____________ in their definite energy levels.

32. Allah has created this universe from some ____________ called elements


33. ______________ was Italian scientist who determined the correct atomic masses of element


34. Lothar Meyer's graph included about _____________ elements


35. Properties of elements are a _______________ of their atomic masses


36. _________________ are the atoms of the same element with different atomic masses.


37. _________________ of atoms play an important role in the arrangement of modern periodic table


38. Elements in the periodic table have been arranged in_____________ of their atomic number


39. ______________ arrangement of elements constitute a group


40. Seventh period is incomplete and contains_____________ elements


41. Periodic table has been divided into _____________ blocks


42. S and P-block elements are called _______________.


43. Seventh period is incomplete and contains element with atomic number _________ to _____________.


44. The elements at the centre of the normal elements possess both metallic and non-metallic characters are called________________.


45. Water is purified from germs by passing ______________ gas through


46. Dobereiner grouped elements with similar properties in ______________.


47. Electron affinity ________________ gradually from top to bottom in group


48. Elements are added in the ______________ shell of both d and f block elements


49. Metals are present on _________________ side of periodic table


50. A piece of sodium metal ______________ around the surface of water with hissing sound


51. An atom is _______________ like an egg


52. Salt forming elements are called ________________.


53. Gases which are present in very small amounts in air are __________________.


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