NCERT Class X Science Class: Chapter –5. Periodic Classification of Elements – Part-3

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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

Image Fluorine and Chlorine Belong to the Same Group

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

Electronic Configuration 2, 8

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

Image Table is Conbelongs to Group 14

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

Image Periods in Modern Periodic Table

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

Image Elctronic Configuration of Na

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

Image Increase Atomic Size in Modern Periodic Table

Image increase atomic size in modern periodic table

Question 13:

Which among the following elements has the largest atomic radius?

Answer: C