Elements A, B, C, 0 and E having the following electronic configuration
(i) $1 s^{2}, 2 s^{2}, 2 p^{1}$
(ii) $1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{1}$
(iii) $1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{3}$
(iv) $1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{5}$
(v) $1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{6}$
Electronic configurations belonging to the same group are :

(i) and (iii)

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(i) and (iv)

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(i) and (ii)

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(i) and (v)

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Solution

The correct option is C (i) and (ii)
(i) and (ii) represent the electronic configuration ( $n s^{2} n p^{1}$ ) of elements come from the same group, i.e. Boron family.

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Q. Match the columns I and II:
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Arrange the elements with the following electronic configurations in the increasing order of electron affinity

(i) $1 s^{2} 2 s^{2} 2 p^{3}$ (ii) $1 s^{2} 2 s^{2} 2 p^{4}$ (iii) $1 s^{2} 2 s^{2} 2 p^{5}$ (iv) $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{4}$

Write the atomic number and electronic configuration of the following elements.

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(ii) Chlorine

(iii) Neon

(iv) Magnesium

Q. Which of the following molecules have the same hybridisation?

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Elements A, B, C, 0 and E having the following electronic configuration(i) 1s2,2s2,2p1(ii) 1s2,2s2,2p6,3s2,3p1(iii) 1s2,2s2,2p6,3s2,3p3(iv) 1s2,2s2,2p6,3s2,3p5(v) 1s2,2s2,2p6,3s2,3p6Electronic configurations belonging to the same group are :

The correct option is C (i) and (ii)(i) and (ii) represent the electronic configuration (ns2np1) of elements come from the same group, i.e. Boron family.

The correct option is C (i) and (ii)
(i) and (ii) represent the electronic configuration ( $n s^{2} n p^{1}$ ) of elements come from the same group, i.e. Boron family.