PERIODIC CLASSIFICATION OF ELEMENTS EXTRA QUESTIONS

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PERIODIC CLASSIFICATION OF ELEMENTS EXTRA QUESTIONS

PERIODIC CLASSIFICATION OF ELEMENTS EXTRA QUESTIONS

Periodic Classification of Elements Extra Questions consists of different laws of classification of elements- Doberiener’s triad, Mendeleev’s periodic classification, modern periodic classification, and Periodicity of properties of elements.

 PERIODIC CLASSIFICATION OF ELEMENTS EXTRA QUESTIONS

If you find any difficulty in finding answers to Class 10 Science Chapter 5 Periodic Classification of Elements extra questions, then go through NCERT solutions of class 10 science or you can comment in the comment section, we will be very pleased to help you.

 

 

CHAPTER-  5   PERIODIC CLASSIFICATION OF ELEMENTS

1.    Describe Dobereiner’s triads?

2.    What are the limitations of Dobereiner’s triads?

3.    What is the law of octaves of Newland?

4.    What are the limitations of Newlands’ law of octaves?

5.    Did Dobereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out?

6.    What criteria were used by Newlands in his classification?

7.    How many elements were there in Newlands periodic table?

8.    How many elements are known today?

9.    How many elements were known around 1800?

10. What do you mean by triads?

11. What was the last element in the Newlands periodic table?

12. Upto which element, the law of octaves was applicable?

13. How many elements were assumed by Newlands?

14. Which types of elements did the Newlands‘s law of octaves work well?

15. How many elements were known at the time of Mendeleev?

16. Why did Mendeleev concentrate on the compounds formed by elements with oxygen and hydrogen?

17. What formula did Mendeleev treat as basic properties of elements for classification?

18. What prefix was used by Mendeleev for the elements that were not discovered at that time?

19. Compare the properties of Eka aluminum and gallium in terms of 

i.   Atomic size

ii. Formula of oxide

iii. Formula of chloride

20. Name the inert or noble gases?

21. What are isotopes?

22. What do you mean by atomic number?

23. Why elements of 1^st group are called alkali metals?

24. What is valency?

25. What do you mean by valence electrons?

26. What is the valency of Mg with atomic number 12 and sulfur with atomic number 20?

27. What is the atomic size?

28. Write the principle of Mendeleev’s periodic table. Give its one achievement and two limitations? .[ Annual board exam-2012]

29. Why atomic size decreases when going from the left side to the right side inside a period?

30. Why does atomic size increase when going from upward to downward in a group?

31. On which side do we find metals in the modern periodic table?

32. What are metalloids or semi-metal?

33. Name the borderline or zig-zag elements in the modern periodic table?

34. How many groups and periods are present in the modern periodic table?

35. Use Mendeleev’s periodic table to predict the formulae for the oxides of the following elements-K, C, Al, Si, Ba.

36. Why do you think the noble gases are placed in a separate group?

37. Name –

i.     Three elements that have a single electron in their outermost shells?

ii.    Two elements that have two electrons in their outermost shells.

iii.  Three elements with filled outermost shells.

38.   Nitrogen (atomic number -7) and phosphorus (atomic number- 15) belong to group 15 of the periodic table. Write of these will be more electronegativity? Why?

39.   How does the electronic configuration of an atom relate to its position in the modern periodic table?

40.  Name any four halogen elements.

41. How many valencies of an element can be found out from its electronic configuration? Give three examples.

42. Define Mendeleev’s Periodic law?

43. What are the achievements of Mendeleev’s periodic table?

44. What are the main limitations of Mendeleev’s periodic table? What were the criteria used by Mendeleev in creating his periodic table?

45. Name the elements which have been discovered later that were left by Mendeleev in his periodic table?

46. What were the criteria used by Mendeleev in creating his periodic table?

47. What is the modern periodic law?

48. Who gave the modern periodic table? What criteria did he use?

49. How could the modern periodic table remove various anomalies of Mendeleev’s periodic table?

50. Compare and contrast the arrangement of elements in Mendeleev’s Periodic table and the Modern periodic table?

                                               OR

Compare Mendeleev and modern periodic table--[ Annual board exam-2013]

i.  On the basis of groups

ii. On the basis of properties of elements

iii. On the basis of classification

51.  Nitrogen ( A.No.- 7) and phosphorous( A.No.- 15) belong to group 15 of the periodic table. Write the electronic configuration of these two elements. Which is more electronegative and why?

52. The position of three elements A, B, and C in the periodic table are shown below-

Group 16           Group 17

  --                          --

  --                          A

  --                           --

  B                           C  

i. State whether A is a metal or non-metal.

ii. State whether C is more reactive or less reactive than A.

iii. Will C be larger or smaller in size than B?

iv.  Which type of ion, cation, or anion will be formed by element A?

53. Below is given a part of the periodic table-

 

 

Li	Be	B	C	N	O	P
Na	Mg	Al	Si	P	S	Cl

 

     Answer the following questions-

i.     Elements that have the smallest and largest atomic sizes.

ii.  The most metallic and the most non-metallic element.

iii. Which is more reactive between F and Cl.

54.   What names did Mendeleev give to scandium, gallium, and germanium?

55.   Why do you think the noble gases are placed in a separate group?

56.  What changes occur in the following properties left to right in a period and upward to downward in a group-

i.    Atomic size

ii.   Metallic property

iii.   Non- metallic property

iv.   Electro positivity

v.      Electronegativity

57. Why first group elements are called alkali- metals?

58. Below is given a part of the periodic table-

         

     

I	II	III	IV	V	VI	VII
A	B	C	D	E	F	G

Answer the following questions-

i.     The most electropositive element.

ii.   The most electronegative element.

iii.  The element with the smallest size.

iv.   The element with the largest size.

60.  

(i) Which element can lose electrons most easily in the 3^rd period and why?

(ii). What happens to the acidic character of oxides down in the group and why?

(iii). Which group elements can gain electrons most easily and why?

(iv). What happens to the basic character of oxides down the group and why?

61.  Give the formula of –(a) Gallium oxide (b) Gallium chloride.

62.  Which of the element is most metallic in group I and why?

63.  Which of the element is most non-metallic in group 16 and why?

Related Topics

• Chapter 5 Periodic Classification of Elements
• MCQ Questions for Class 10 Science Chemistry Chapter 5