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Question

Which of the following is not isoelectronic?


A

CH3+

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B

H3O+

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C

NH3

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D

CH3

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Solution

The correct option is A

CH3+


Let's calculate number of electrons for each molecule.

CH+3C=6 electronsH3=3 electrons}1 electron[Because of + charge] = 8 electrons
H3O+H33 electronsO8 electrons}- 1 electrons [Because of + charge] = 10 electrons
NH3N7 electronsH33 electrons}10 electrons

CH3C6 electronsH33 electrons}+1 electrons[Because of - charge] = 10 electrons
Therefore,H3O+,NH3 and CH3 are isoelectronic


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