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Element A has principal quantum number 2 for last electron and it has 3 electrons in valence shell and eletnent B has principal quantum number 3 for last electron and it has 7 electrons in valence shell. The bond angle in compound of A and B (containing single central atom) will be :

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90°

120°

60°

180°

answer is A.

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Detailed Solution

The B follows, given conditions as,

$B \to 1 s^{2} 2 s^{(2)} 2 p^{2}$

As, B has principal quantum number 3 for last electron and it has 7 electrons in valence shell. Thus, the compound will be,

${BF}_{3}$

Thus, the bond angle in compound of A and B (containing single central atom) will be 120 degree.

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