NCERT Class X Science Class: Chapter – 5. Periodic Classification of Elements – Part-3 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 7:

The elements A, B, C, D and E have atomic number 9, 11,17, 12 and 13 respectively. Which pair of elements belong to the same group?

  1. A and B
  2. B and D
  3. A and C
  4. D and E

Answer: C

Image Fluorine and Chlorine Belong to the Same Group

Question 8:

Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table?

  1. Group 8
  2. Group 2
  3. Group 18
  4. Group 10

Answer: C

Electronic Configuration 2,8

Question 9:

An element which is an essential constituent of all organic compounds belongs to

  1. Group 1
  2. Group 14
  3. Group 15
  4. Group 16

Answer: B

Image Table is Conbelongs to Group 14

Question 10:

Which of the following is the outermost shell for elements of period

  1. K shell
  2. L shell
  3. M shell
  4. N shell

Answer: B

Image Periods in Modern Periodic Table

Question 11:

Which one of the following elements exhibit maximum number of valence electrons?

Answer: D

Image Elctronic Configuration of Na

Question 12:

Which of the following gives the correct increasing order of the atomic radius of O, F and N?

Answer: D

Image Increase Atomic Size in Modern Periodic Table

Question 13:

Which among the following elements has the largest atomic radius?

Answer: C