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Atomic Number

Subshell elec...

Question

Subshell electronic configuration of two elements are given. To which block, period and group does each belong

$(a) 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} (b) 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{3} 4 s^{2}$

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Solution

(a) Element belongs: block- s period- 3 group- 2

(b) Element belongs: block - d period- 4 group - 5

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A = 1s², 2s², 2p¹
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Q. The electronic configuration of Al is : [ 1 Mark]
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Q. Electronic configurations of three elements, A, B and C are given below.

A:

1 s^{2} 2 s^{2} 2 p^{6}

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{3}

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{5}

The bond between B and C will be

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