Question

Elements E-1,E-2,E-3,E-4 and E-5 have atomic number 13,11,12,17 and 19 respectively.which of these belongs to same group ?
(a) E-1 and E-4
(b) E-4 and E-5
(c) E-2 and E-4
(d) E-1 and E-2

Answer 1

Answer:

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>>The elements A, B, C, D and E have atomi

Question

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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?

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Solution

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Correct option is C)

Let us take a look at the electronic configurations of the given elements,

A: (2, 7)

B: (2, 8, 1)

C: (2, 8, 7)

D: (2, 8, 2)

E: (2, 8, 3)

We can see that elements A and C both have 7 valence electrons. Thus, both the elements belong to the same group.

So, the correct option is C