Tuesday, May 3, 2011

Trends on the Periodic Table

Last class we learned some terms in chemistry. Let's review them!
Atomic Radius: The atomic radius of a chemical element is a measure of the size of its atoms
Melting Point: The temperature a chemical reaches when it melts
Boling Point: The temperature a chemical reaches when it boils
Ionization Energy: The energy required to move an electron from an atom
Electronegativity: The tendency of an atom or radical to attract electrons in the formation of an ionic bond

The Trend of Periodic Table
- Elements close to each other have similar characteristics
Atomic Radius  - radius decreases moving → on the table
 - increases moving ↓ (a family)
Melting Point and Boiling Point - elements in the center of the table of highest MP and BP
- Noble gas has the lowest
- Increases moving → until the middle of the table
Ionization Energy - energy increases going ↑ and →
- Noble gases have the highest ionization energy because they have a full valence shell
Electronegativity -  energy increases going ↑ and →
Metallic Properties - elements become more metallic going ↓ a family

Visit  http://www.ptable.com for a dynamic and fun periodic table to visualize the trends!

- Catherine

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