2 Chemical Bond A force that holds two or more atoms together This happens because atoms prefer to have a full outer shellAtoms can share, lose, or gain valence electrons
3 Atoms want to be STABLEAtoms are stable when their outer most energy level is fullUnstable atoms have spaces in their outer energy levelAll atoms are unstable alone except for which group?Noble GasesBecause most are unstable alone, they combine with others to become stable
4 How will we represent bonds? How do atoms Bond?Ionic bondsCovalent bondsBy using Lewis Dot DiagramsOnly concerned with valence electrons!!How will we represent bonds?
5 QuestionWhich electrons are we concerned with during bonding?
6 Lewis Dot Diagram Refresher Draw the diagram for:BerylliumAluminumTinBismuthRadon
7 Ionic BondsWhen atoms become stable by either giving or taking electrons from another atomMost often a metal and a non-metal bondNeutral atom- if # of protons and # of electrons are equalIon- an atom that has gained or lost electronsIons have electrical charges
8 Question Most of the atoms on the periodic table are neutral. (T/F) Most of the time, which two types of elements are bonding together in an ionic bond?(metal and non-metal/ non-metal and non-metal/ metal and metal)
9 Ions Cation- an atom that loses electrons Have positive chargesNa+Anion- an atom that gains electronsHave negative chargesCl-Opposites Attract!!Atoms with opposite charges bond together
10 Question What is an ion? O ++ is an example of (anion/cation) How/why do ionic bonds form?
12 Covalent BondsWhen two atoms share their outer energy level by sharing a pair of electronsMost often a non-metal and a non-metal bondBoth atoms keep their valence electronsCharges don’t change, but they become stable