Tuesday, November 21, 2006

Electronic Configuration

Learning Outcome:At the end of the sessions, you must be able to draw or make the electronic configuration of any given element

Learning Presentation:

It is important to know how to draw the electronic configuration of elements because it is a way to know the properties of element. click here to know how.

Another great way to memorize the mnemonics for electronic configuration is the following rhyme :

Si Sally Pumasok Sa Pinto Si Daddy Pumasok Sa Dilim Paano Si Franky Daddy Paano Si Franky Daddy Franky Daddy Franky (Each letter corresponds to the shape fill it in with the principal quantum number start numbering S with 1, P with 2, D with 3, and F with 4)

Wednesday, November 08, 2006

Atomic Emmission Spectra

Learning Outcome:At the end of the sessions, you must be able to explain how the emission spectra of elements provide for the existence of the energy level

Learning Presentation:

Colors add beauty to life and all the things around us. But what is color and how do see color? Visible light waves are the only electromagnetic waves we can see. We see these waves as the colors of the rainbow. Each color has a different wavelength. Red has the longest wavelength and violet has the shortest wavelength. When all the waves are seen together, they make white light. Direct evidence of this is the rainbow.

Visible Light color is can be separated by lenght of wavwlenght. click here to find out

Elements give out specific color of light when their electrons are exited and promoted to the next energy level (we will discuss this later) this wavelenght helps in the identification of elements that are present in other planets or stars like how helium is discovered in the sun.

TO identify elements present chemist perform a flame test. (Atomic emmssion spectra flame test click here (this requires window media player)