Q6 of 52 Page 38

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

Elements A is fluorine (atomic number 9) and C is chlorine (atomic number 17) belong to the same group. These two elements belong to group 17 of the periodic table.

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4

Which of the following statement(s) about the Modern Periodic Table are incorrect?

(i) The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic number.


(ii) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses.


(iii) Isotopes are placed in adjoining group (s) in the Periodic Table.


(iv) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic number.

 5

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

 7

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

 8

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