Tuesday, October 5, 2010

Electron Configuration

Today in Chemistry, we started off by getting worksheet pg.5 stamped and then Mrs. Mandarino went over the answers. We then finished up the notes on s, p, and d orbitals. Remember that s orbitals are spherical, p orbitals are dumb bell shaped, and d orbitals are a combination of 2 p orbitals. After that, we learned a new concept: Electron configuration. Here is an example of electron configuration

He 1s2

-He is the thing we are finding the electron configuration for.
-1 is the level
-S is the type of orbital
-The superscript 2 is the number of electrons.

To make things easier, we took our own individual periodic table and labeled the different types of levels and orbitals. This helps us to write electron configuration. You read it from left to write. Also, we learned that:

s orbitals can hold a maximum of 2 electrons,
p orbitals can hold a maximum of 6 electrons,
d orbitals can hold up to 10 electrons,
and f orbitals can hold a maximum of 14 electrons.

After learning about electron configuration, we practiced writing it. We worked on pg. 6 and 7. There are two ways of writing electron configuration. One is the long way like Ca=1s22s22p63s23p64s2. Writing all that can be very tedious so another way to write it is like this: Ca=[Ar] 4s2. This is the abbreviation. You put down the last noble gas before the element and then continue from there.

Homework for tonight is to read pg. 130-136 in the textbook, worksheet pg. 9, and to do web assign. Test is this Friday!

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