2CHEMICAL CHANGE AKA Chemical Reaction Occurs when chemical bonds are destroyed and new bonds made.
3Electron Number and Organization The number of electrons in an atom can be determined from the atomic number of the element.Remember?Atomic # = # of protons = # of electrons=
4Where are the electrons? Electrons in an atom are organized in energy levels.The next slide shows a model of the arrangement of electron in an atom. This model and models like it are useful for counting electrons.
9Valence & Bonding # of Valence electrons determines bonding. Atoms that have 8 valence electrons do not usually form bonds because they are full.Atoms that have less than 8 valence electrons form bonds because they are not full