Q21 of 60 Page 140

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

Carbon is the element which is essential constituent of all organic compounds and lies in group 14.

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19

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

 20

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

 22

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

 23

Which of the following set of elements is written in order of their increasing metallic character?