objectives: swbat: identify and describe the formation of ionic bonds
DESCRIPTION
Types of Bonds. Objectives: SWBAT: Identify and describe the formation of ionic bonds. SWBAT : Predict the charged ion an atom will form. Bellringer : Draw the Lewis Dot Structure for Fluorine, Phosphorus, Beryllium. Valence Electron Game. Directions: - PowerPoint PPT PresentationTRANSCRIPT
Objectives: SWBAT: Identify and describe the formation of ionic bonds.
SWBAT: Predict the charged ion an atom will form. Bellringer: Draw the Lewis Dot Structure for
Fluorine, Phosphorus, Beryllium
Types of Bonds
Valence Electron GameDirections: • Compete against your table partner
• Goal: Be the first to circle the correct number of valence electrons for a given atom.
•On the following slides are elements. When we click on the slide, circle the number on your scorecard that corresponds to the number of valence electrons in the element.
O6
Be2
F7
C4
Li1
Ne8
B3
+ =
Na Cl NaCl
Compounds
• A compound is a pure substance made up of two or more elements in which the elements are chemically combined
Chemical Bond = the attraction that holds atoms together
Why do atoms bond?
Atoms bond in order to become stable (fill their outer shell)
Octet Rule
• All atoms want to become super stable, awesome, Noble gasses!
• In other words, all atoms want 8 valence electrons.
Types of Chemical Bonds1) Ionic bond = electrons are
TRANSFERRED between atoms
Occurs between metal and nonmetal
Types of Chemical Bonds2) Covalent bond = electrons are
SHARED between atoms
Occurs between nonmetal and nonmetal
Ion = charged atom
Ca+ions are posi+ive
Anions are negative
Ionic Bonds
• Sodium has one valence electron it wants to lose• Chlorine has 7 valence electrons, so it wants to
gain one more to make it to eight.
·Na Cl ::·
:
Ionic Bonds
• The Sodium atom donates its one valence electron to Chlorine.
·Na Cl ::·
:
Ionic Bonds
• Now, both atoms have a full outer electron cloud.• Na is now positively charged = cation (+1 because it now
has 1 more PROTON than electrons)• Cl is now negatively charged = anion (-1 because it now
has 1 more ELECTRON than protons)• The 2 atoms are held together by the electrostatic
attractions (think of magnets!)
·Na+1 Cl-1 ::
·
:
Ionic Bonds
• Sodium and Chloride are now ionically bonded to form a new compound known as sodium chloride (NaCl).
• This is known to most of us as Table Salt.
Na Cl ::
::
Ionic Bonds• Chat Chum practice- – Group work- Level 2- Raise hand for help!
• Draw the Lewis Dot Structure for • K • Cl
• Show with arrows the movement of the electrons.• Redraw the atoms with the new number of valence
electrons• Show the CHARGE on the atoms (which is the
cation and which is the anion)• Draw the bonded molecule!
Ionic Bonds• Chat Chum practice-
– Group work- Level 2- Raise hand for help!
• Draw the Lewis Dot Structure for • Li• Br
• Show with arrows the movement of the electrons.• Redraw the atoms with the new number of valence electrons• Show the CHARGE on the atoms (which is the cation and
which is the anion)• Draw the bonded molecule!
Ionic Bonds
• Who wants to draw their process on the board?
Challenge Problem!• Individual Practice-– Level 0/Level 1 if you need help- Ask Chat Chum first,
then raise hand!
• Draw the Lewis Dot Structure for – Mg– O
• Show with arrows the movement of the electrons.• Redraw the atoms with the new number of valence
electrons• Show the CHARGE on the atoms (which is the cation
and which is the anion? )• Draw the bonded molecule!
Homework!
• Practice: Ionic Bonding