Learn about valence electrons. Get the definition and a periodic table showing the number of valence electrons for each element.| Science Notes and Projects
Learn about the octet rule in chemistry. Get the definition, see examples, and learn about exceptions to the rule.| Science Notes and Projects
Get the atomic number definition. See examples of the atomic number and learn how it differs from mass number.| Science Notes and Projects
Learn what noble gases are, which elements are included in the group, and what properties distinguish a noble gas from other element of the periodic table.| Science Notes and Projects
The atom is the unit of matter that identifies a chemical element. Here are 10 interesting atom facts for education and entertainment.| Science Notes and Projects