Question

Which of the following is not correct for iso-electronic ions?

• A. They have the same number of electrons around their nuclei
• B. Higher the atomic number, higher will be positive charge in a series of isoelectronic ions of same period
• C. Isoelectronic ions have same electric charge
• D. An isoelectronic series may have both positively and negatively charged ions

Answer 1

Answer: (C)

Isoelectronic species have same number of electrons not same isoelectric charge. For example $N ^{3}, O ^{2-}, F ^{-}$ are isoelectronic but have different charge.