What do the numbers represent?
Upper Left numbers?: Atomic Number; it keeps track of the number of protons.
Upper Right numbers?: Atomic Mass; is the weight of the atom.
Mg- What is this? Magnesium The letters represent the symbol for each element.
What is the difference between Na & K?
Na: Salt
K: Potassium
The difference between these is that their chemical composition, color, and density are different. They both have a different atomic number as well as a different atomic mass.
http://simple.wikipedia.org/wiki/Periodic_table
http://en.loadtr.com/Periodic_Table_could_have-438617.htm
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