Q20 of 60 Page 140

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

2,8 is completely filled electric configuration so it must be noble gas which lies in group 18.

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18

Which of the given elements A, B, C, D and E with atomic numbers 2, 3, 7, 10 and 30 respectively belong to the same period?

 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?

 21

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

 22

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