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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+3⇒C=6 electronsH3=3 electrons}−1 electron[Because of + charge] = 8 electrons H3O+⇒H3→3 electronsO→8 electrons}- 1 electrons [Because of + charge] = 10 electrons NH3⇒N→7 electronsH3→3 electrons}10 electrons CH−3⇒C→6 electronsH3→3 electrons}+1 electrons[Because of - charge] = 10 electrons Therefore,H3O+,NH3 and CH3− are iso−electronic

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