Bohr’s Model

1. Periodic Trends: How can we use the table to quickly make a guess about an element’s physical and chemical properties? Bohr’s Model Electron Configuration

2. Periodic Trends: How can we use the table to quickly make a guess about an element’s physical and chemical properties? Atomic Radius: How big is an atom? How can we tell just by looking at the table? Most Likely Charge: When an atom interacts with other atoms it will either gain or lose electrons. How do we know whether an atom will gain or lose? And, how many electrons will it gain or lose? Ionic Radius: How big is an atom AFTER it has gained or lost electrons? How can we tell just by looking at the table? Electronegativity: a measure of an atom’s ability to grab electrons from other elements Ionization Energy: a measure of how difficult it is to remove an electron from that atom

4. Atomic Radius: Why do atoms get larger as we go down a family?

5. Atomic Radius: Why do atoms get smaller as we go from left to right in a period?

7. Ionic Radius: Why are POSITIVE ions smaller than the atoms from which they are formed? Image from http://en.wikipedia.org/wiki/File:Atomic_%26_ionic_radii.svg#filelinks

8. Ionic Radius: Why are NEGATIVE ions larger than the atoms from which they are formed? Image from http://en.wikipedia.org/wiki/File:Atomic_%26_ionic_radii.svg#filelinks

9. Electronegativity is a measure of an atom’s ability to grab electrons from other elements

10. Ionization Energy is a measure of how difficult it is to remove an electron from that atom