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Question

Which of the following pairs represent isoelectronic species?

A
S2 and Sc3+
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B
SO2 and NO3
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C
N2 and CN
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D
NH3 and H3O+
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Solution

The correct options are
A S2 and Sc3+
B N2 and CN
C SO2 and NO3
D NH3 and H3O+
Species having the same number of electrons are known as isoelectronic.

S2 and Sc3+=18 electrons (16+2 for sulphur, 213 for scandium)

SO2 and NO3=32 electrons( 16+16 for SO2 and 7+24+1 for NO3)

N2 and CN=14 electrons (7+7 for N2 and 6+7+1 for CN)

NH3 and H3O+=10 electrons (7+3 for NH3, 3+81 for H3O+)

Hence, options A, B, C, and D are correct.

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