ELECTRONS
IN ATOMS
ELECTRONS ARE THE
MOST INTERESTING
PART OF ATOMS
AUFBAU PRINCIPLE, PAULI EXCLUSION
PRINCIPLE AND HUND’S RULE
EXAMPLES
• What is the electron configuration for phosphorus
(atomic number 15)?
• 1s22s22p63s23p3
• Carbon (atomic number 6)?
• 1s22p4
• Argon (atomic number 18)?
•
1s22s22p63s23p6
LEWIS DOT DIAGRAMS
This Photo by Unknown Author is licensed under CC BY-SA
EXAMPLES
• What is the Lewis dot diagram for phosphorus (atomic number 15)?
• Carbon (atomic number 6)?
• Argon (atomic number 18)?
WHAT DOES THE
PERIODIC TABLE TELL
US?
Three broad
classes:
Metals

Solid

Good conductors of
electricity

Ductile

Malleable
Non-metals

Brittle

Poor conductors
Semi-metals
(Metalloids)

Partially conduct
electricity