7/26/2019 015-Ionization Energy II

1/7

1

Slightly EnlargedI1 for Be, Mg, and Ca

7/26/2019 015-Ionization Energy II

2/7

2

Slightly EnlargedI1 for Be, Mg, and Ca

The electrons in the filled 2s orbital provide

some shielding for electrons in the 2p orbital

from the nuclear charge. (p93, 2) A 2s electron spends more time closer to the nucleus

than a 2p electron.

7/26/2019 015-Ionization Energy II

3/7

3

Slightly ReduceI1 for O and S

7/26/2019 015-Ionization Energy II

4/7 4

Slightly ReduceI1 for O and S

The extra electron repulsions in the doublyoccupied oxygen 2p orbital. (p93, 2)

7/26/2019 015-Ionization Energy II

5/7 5

2A Configuration: LargerI

7/26/2019 015-Ionization Energy II

6/7 6

6A Configuration: SmallerI ?!

7/26/2019 015-Ionization Energy II

7/7 7

Trends in the 1st Ionization Energies

for the Representative Elements

p93, Figure 2.33