Among the following which is not isoelectronic with others
HF

H2O

NH3

CO

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Solution

Dear student

Isoelectronic species have same number of electrons.
The number of electrons in:
HF = 1+9 =10
H₂O = 2+8= 10
NH₃ = 7+3 =10
CO = 6+8 =14
Thus option (d) CO is not isoelectronic with the rest of the species.

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