2. n=1 n=2 n=3

3. Mg (Z=12) Radii Ne=0.69 Å Na=1.54 Å Mg=1.30 Å

4. Atomic Radii

5. Grey = Neutral Radii, Red = Cationic Radii, Blue = Anionic Radii

6. Isoelectronic Series Radii O 2- = 1.40 Å F - = 1.33 Å Na + = 0.97 Å Mg 2+ = 0.66 Å Isoelectronic atoms/ions have identical numbers of electrons. As the nuclear charge in an isoelectronic series increases the size of the atom decreases.

7. Periodic Trends in 1 st Ionization Energy

8. C P Se I Non-metals, high 1 st IE S As Si Ga Zn

9. Beyond 1 st Ionization Energy

10. Electron Affinity

11. Properties of the Group I & II Metals