The following species each have the same number of electrons. Their radii compar

Question

The following species each have the same number of electrons. Their radii compare as shown: P3- > S2- > K+ > Ca2+ The reason for this trend in size is Select one:

a. there is increased crowding of electrons in the outer shell going from P3- to Ca2+.

b. there is an increase in atomic weight going from P3- to Ca2+.

c. the outer electrons change from the 3rd shell to the 4th shell going from P3- to Ca2+.

d. there is an increase in the effective nuclear charge experienced by the outer electrons from P3- to Ca2+.

e. there is a decrease in electron affinity going from P3- to Ca2+.

Explanation / Answer

The correct option is

D. there is an increase in the effective nuclear charge experienced by the outer electrons from P3- to Ca2+.

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