chemical bonding
DESCRIPTION
Chemical Bonding. Chemical Bond. A force that holds two or more atoms together This happens because atoms prefer to have a full outer shell Atoms can share, lose, or gain valence electrons. Atoms want to be STABLE. Atoms are stable when their outer most energy level is full - PowerPoint PPT PresentationTRANSCRIPT
Chemical Bonding
Chemical BondA force that holds two or more
atoms together◦This happens because atoms prefer
to have a full outer shell◦Atoms can share, lose, or gain
valence electrons
Atoms want to be STABLEAtoms are stable when their outer
most energy level is fullUnstable atoms have spaces in
their outer energy level◦All atoms are unstable alone except for
which group? Noble Gases
Because most are unstable alone, they combine with others to become stable
How do atoms Bond?Ionic bondsCovalent bonds
By using Lewis Dot DiagramsOnly concerned with valence
electrons!!
How will we represent bonds?
QuestionWhich electrons are we
concerned with during bonding?
Lewis Dot Diagram RefresherDraw the diagram for:
◦Beryllium◦Aluminum◦Tin◦Bismuth◦Radon
Ionic BondsWhen atoms become stable by either
giving or taking electrons from another atom◦Most often a metal and a non-metal bond
Neutral atom- if # of protons and # of electrons are equal
Ion- an atom that has gained or lost electrons◦ Ions have electrical charges
QuestionMost 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)
IonsCation- an atom that loses
electrons◦Have positive charges◦Na+
Anion- an atom that gains electrons◦Have negative charges◦Cl-
Opposites Attract!!◦Atoms with opposite charges bond
together
QuestionWhat is an ion?O ++ is an example of
(anion/cation)
How/why do ionic bonds form?
Covalent BondsWhen two atoms share their
outer energy level by sharing a pair of electrons◦Most often a non-metal and a non-
metal bond
Both atoms keep their valence electrons
Charges don’t change, but they become stable