Today's material covers Chapter 2: Atoms, Molecules, and Ions.
I first defined an atom and described the three subatomic particles an atom is composed of: the proton, neutron, and electron.
Next we defined an element and then described the notation chemists use to represent elements. From these symbols you MUST be able to determine how many protons, neutrons, and electrons each element possesses. Also, if I give you the number of protons, neutrons, and electrons and atom/ion has you must be able to produce the proper elemental symbol.
An element is characterized by the number of protons it has. If we vary the number of protons we have an new element. But chemists can manipulate the number of neutrons and electrons an element contains. This leads to two new terms: ions and isotopes. Be sure you know the similarities and differences between atoms, elements, isotopes, and ions.
We ended lecture discussing the atomic mass listed on the periodic table and we will start on Wed by finishing the calculation to determine the atomic mass of chlorine.
If you have been keeping up with the material you should be finished with homework set #1 and I will post a new homework set tomorrow evening after the first set of quizzes have been completed.
See you in class on Wed, Dr. Fus
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