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Question

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?

A
A and B
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B
B and D
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C
A and C
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D
D and E
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Solution

The correct option is C A and C
A is florine B is Sodium C is chlorine D is magnesium and E is Aluminium
Thus out of these Florine and Chlorine belong to the seventeenth group. Thus correct option is Option C.

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