2 CHEMICAL CHANGE AKA Chemical Reaction Occurs when chemical bonds are destroyed and new bonds made.
3 Electron 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=
4 Where 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.
9 Valence & 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