2. Charge effect The more electrons are on the same ring and the more protons are in the nucleus the smaller the atomic radius Opposite charges attract!!! Lithium Nitrogen

3. Shield Effect The more rings a Bohr’s model has, the larger the element Rings repel each other Makes element even larger!!! The higher the shield effect, the larger the atom!

4. Size Trend in the Periodic Table Size increases: Left ← Right Top ↓ Bottom

5. What is the largest element of the PT _____ the smallest element of the PT ______ Q: Which one is larger____ a) C or Si b) Si or Cl

6. Ionization Energy Energy needed to remove a valence e- from an element. high in small elements with a large charge effect low in large elements with a large shield effect a. Element with highest IE __________ b. Element with lowest IE ________

7. Circle the element with the higher IE: a) K or Kr b) Be or Ca

8. Journal Circle the element with the 1. Smaller radius a) Cu or Au b) Hg or Zn c) Ar or Na 2. Higher charge effect a) Kr or Brb) B or F c) K or Kr 3. Lower Ionization energy a) P or Oc) Mg or Sr c) N or Mn

9. Warm-up 1. List all metalloids 2. Sort Ac, Th, Pa, U, Np from Lowest→Highest a) Ionization Energy b) Atomic Number c) Radius 3. Are they solid/liquid/gases? 4. What type of metal are they?