NCERT Class X Science Class: Chapter –5. Periodic Classification of Elements – Part-2

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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

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

Image group 18 in Modern Periodic Table

Image Group 18 in Modern Periodic Table

Image group 18 in Modern Periodic Table

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 all organic compounds Periodic Table

Image All Organic Compounds Periodic Table

Image all organic compounds Periodic Table

Question 10:

Which of the following is the outermost shell for elements of period 2?

  1. K shell

  2. L shell

  3. M shell

  4. N shell

Answer: B

Question 11:

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

Answer: D

Question 12:

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

Answer: D

Question 13:

Which among the following elements has the largest atomic radii?

Answer: C

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