Honors Chemistry Name______________________________

Periodic Trends Questions

Mr. McAfoos Period________ Date__________________

1. What is the most important factor for predicting changes in the periodic properties (ionization potential, electronegativity, atomic radius, ionic radius) as you move from the left side of the chart to the right and why does it matter?

2. The number of electrons in an atom does NOT have an effect on the periodic properties as you move left to right on the chart. Why not?

3. What is the most important factor for predicting changes in the periodic properties as you move down a column on the chart?

4. Sodium has 11 protons and lithium has 3, yet it is harder to steal an electron from lithium than it is from sodium. Why? Why don’t the extra protons seem to matter?

5. Ionization potential increases as you move from the left side of the chart to the right, but not consistently. What are the exceptions? Why are there exceptions?

6. What happens to the size of atoms as you move from the left side of the chart to the right and why? What happens to the size of the atoms as you move from the top of the chart to the bottom and why?

7. Place the ions on the 3^rd row of the chart (Na – Cl) in order from smallest to largest. Explain.

8. Fluorine has the highest electronegativity of any element on the chart. Why does fluorine have a higher electronegativity than Chlorine? Why does fluorine have a higher electronegatitvity than oxygen? Why doesn’t helium have the highest electronegativity?