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

A a n d B

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B a n d D

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A a n d C

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D a n d E

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Solution

The correct option is C $A a n d C$
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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Similar questions

The elements A, B, C, D and E have atomic numbers 9, 11, 17, 12 and 13 respectively. The which belongs to the same group of the periodic table is :

(a) A and B (b) B and D (c) A and C (d) D and E

A, B, C, D a n d E

1.2 e V, 2.4 e V, 3.6 e V, 4.8 e V a n d 6.8 e V

4000 A^{\circ}

The atomic numbers of three elements A, B and C are given below :

Element Atomic number

A 5

B 7

C 10

(i) Which element belongs to group 18? (ii) Which element belongs to group 15?

(iii) Which element belongs to group 13? (iv) To which, period/periods do these elements belong?

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