# Problem: The electron affinities of the following 4th row elements have the following values: K + e - →  K -1       EA = -48 kJ/moles Ca + e - →  Ca -1   EA = -4 kJ/moles  Ga + e - →  Ga -1   EA = -30 kJ/moles From the standpoint of the electron configuration of the atoms, explain this trend, in particular, why Ca is a small exothermic value.

###### FREE Expert Solution
95% (170 ratings)
###### Problem Details

The electron affinities of the following 4th row elements have the following values:

K + e - →  K -1       EA = -48 kJ/moles

Ca + e - →  Ca -1   EA = -4 kJ/moles

Ga + e - →  Ga -1   EA = -30 kJ/moles

From the standpoint of the electron configuration of the atoms, explain this trend, in particular, why Ca is a small exothermic value.

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Periodic Trend: Electron Affinity concept. You can view video lessons to learn Periodic Trend: Electron Affinity. Or if you need more Periodic Trend: Electron Affinity practice, you can also practice Periodic Trend: Electron Affinity practice problems.

What is the difficulty of this problem?

Our tutors rated the difficulty ofThe electron affinities of the following 4th row elements ha...as medium difficulty.

How long does this problem take to solve?

Our expert Chemistry tutor, Jules took 2 minutes and 54 seconds to solve this problem. You can follow their steps in the video explanation above.