Question

Which of the following is an isoelectronic series?

A. S, Cl, Ar, K
B. F-, Cl-, Br-, I-
C. O2-, F-, Ne, Na+
D. Si2-, F2-, S2-, Cl2-
E. B5-, Si4-, As3-, Te2-

Answer 1

Atoms and ions that have the same electron configuration are isoelectronic. The number of protons determines the size of isoelectronic ions and atoms.

Step-by-step explanation:

Atoms and ions that have the same electron configuration are said to be isoelectronic.

Examples of isoelectronic species are N³, O²-, F¯, Ne, Na+, Mg²+, and Al³+ (1s²2s²2p6).

Another isoelectronic series is P³-, S²-, Cl¯, Ar, K¹, Ca²+, and Sc³+ ([Ne]3s²3p6).

For atoms or ions that are isoelectronic, the number of protons determines the size.

The greater the nuclear charge, the smaller the radius in a series of isoelectronic ions and atoms.