1. Pre – AP Physical Science
Bond Types

3. electrons occupy lowest energy levels available
Basic Principle:
electrons occupy lowest energy levels available

4. Aufbau Principle – “Diagonal Rule”4

5. 2 ways to write electron configurations1 s
value of energy level
sublevel
no. of
electrons
spdf NOTATION
for H, atomic number = 1
1) spdf Notation
Orbital Box Notation
Arrows show electron spin
ORBITAL BOX NOTATION
for He, atomic number = 2 1s 2  5

7. The Octet Rule Atoms tend to gain, lose or share electrons until they are surrounded by eight valence electrons.

8. Valence Electrons Valence electrons are found in the incomplete outermost shell of an atom.