BITSAT2017ChemistryChemical Bonding and Molecular StructureActual
Which of the following are isoelectronic species? I. C + H 3 II. NH 2 - III. NH 4 + IV. NH 3
Options
- AI ,   II and III
- BII ,   III and IV
- CI ,   II and IV
- DII and I
Correct answer
B. II ,   III and IV
Step-by-step solution
I. Number of electrons in C + H 3 = 6 + 3 - 1 = 8 II. Number of electrons in NH 2 - = 7 + 2 + 1 = 10 III. Number of electrons in NH 4 + = 7 + 4 - 1 = 10 IV. Number of electrons in NH 3 = 7 + 3 = 10 Since, species with same number of electrons are called isoelectronic species, Hence, IInd , IIIrd and IVth are isoelectronic.