Electron Configuration

Question 1

Aufbau Principle, Pauli Exclusion Principle, & Hund’s Rule

Answer 1

• Aufbau Principle: E- Fill in the lowest energy level, attracted to P+
• Pauli Exclusion: Electrons in the same orbital must have opposite spins > Prevents Repulsions
• Hund’s Rule: Electrons spread out within a sub level before pairing

Question 2

Exception Elements

Answer 2

Cr, Mo, Cu, Ag, Au

Question 3

Valence Electrons

Answer 3

Electrons in the outermost shell (Principle Level)
Top of each group level!

Question 4

Why are valence electrons important?

Answer 4

*The more VE an atom holds, the more stable the atom is.
* The less VE an atom has, the more reactive they are (Inverse)

Question 5

Ionic Charge

Answer 5

The particular charge of an element.