Ionization Energy & Electron Affinity

Shireen Rudina

What is the last term in the electron configuration of Mg?

1. 2s1

2. 3s2

3. 2s2

4. 4s2

5. 1p6

What is the last term in the electron configuration of Co?

1. 4d6

2. 3s2

3. 4d7

4. 4p6

5. 3d7

What is the correct electron configuration of oxygen (O)?

1.

2.

3.

Ionization energy Activity

Definition: The energy needed to remove an electron from an atom

Can also be IE2, IE3, etc.

Effect of Suborbitals

Effect of Z & Electron Shielding

Across rows: increased positive charge holds electrons tighter

Down rows: Shells are farther away from the nucleus and experience shielding

IE1:Na: 498 Mg: 736Al: 577Si:787P: 1063

Electron affinity

• Ability of an ion to gain electrons

• Can be positive or negative– Positive= prefers to not gain electron– Negative= prefers to gain an electron