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The Elements A, B, C, D and E Have Atomic Numbers 9, 11, 17, 12 and 13 Respectively. the Pair of Elements 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 - Science

The elements A, B, C, D and E have atomic numbers 9, 11, 17, 12 and 13 respectively. The pair of elements 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

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Solution

(c) A and C
Electronic configuration of A (9) : K L
                                                       2  7
Electronic configuration of C (17): K L M
                                                         2  8 7
Group number of A and B = valence electron + 10
                                           =  7+10 = 17.

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Lakhmir Singh Class 10 Chemistry (Science)
Chapter 5 Periodic Classification Of Elements
Q 41 | Page 305
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