1. 9/21-24 History of the Atom 13 ▲ Warm up:
Identify the highest ionization energy
highest electronegativity
largest atomic radius
for the following:
Br-Ar
O-F
Cs-Ba

2. Atomic Theory Timeline

4. Modern Theory of the Atom
• Electrons (- charged)-found outside the nucleus in orbitals
• Protons (+ charged)-found inside the nucleus
• Neutrons (o charge)-found inside the nucleus

5. Relative size Nucleus extremely small compared to rest of atom
…..although the nucleus contains most of the mass

6. Connection to Periodic Table

7. 9/24 Periodic Table Design 14 ⭐