Knowledge Rating Know it! Think I know it! NO Clue!
KI TKI NC
Valence electronsElectron dot structuresOctet ruleAnionCationIonic BondMetallic BondHalide ion
Write your own definition of each term!
4 things can happen when elements come together to form
compounds?
1. Atoms can lose electrons2. Atoms can gain electrons3. Atoms can share electrons4. Share pooled electrons
Otherwise known asIonic Bonding
Metals are easy-1. give up valence electrons2. become positively charged
Nonmetals are users1. take valence electrons
whenever possible2. become negatively charged
First- Let’s draw the Bohr model for Na and Cl
How many valence electrons does each element have?
What happens when the metal looses his electron?
What happens when Cl gains and electron?
What do we know about the
stability of Nobel gases?Octet rule- atoms in compounds
tend to have the electron configuration of a nobel gas.
A Really Long Song...
Want to learn an easier way of drawing valence electrons around
atoms?
Lewis Dot structures- Write the symbol and the electrons (in their correct spots!)
Let me show you sodium and chlorine!
Now you try1. Magnesium2. Oxygen3. Fluorine4. Potassium5. Phosphorous
I forget… how can I tell how many valence electrons are in a group?
Oxidation NumbersJust a fancy name for the charge----
It’s the number of valence electrons an atom wants to give up--- or receive to achieve a nobel gas configuration
Magnesium Sulfide• Draw the LS for Magnesium• How many electrons can it give up?
• Draw the LS for SulfurHow many empty spots does it have?
Does it make sense that these two will fit together?
Triplets??Draw LS for Nitrogen
How many Sodium atoms are needed to “complete” nitrogen
Name the ionic compound!
Warm Upa. Draw the Lewis Structures for calcium
and bromine.b. Identify the type of atom (metal or
nonmetal).c. Draw arrows to show the movement
of electrons.
We can always tell how many atoms of each element will form a neutral
compound…
Criss Cross method
Work on the Ionic Bonding WS
Naming ionic compounds
• Name the cation (metal)… ….then the anion (nonmetal)
and add “ide”
CaCl2
Let’s practice a few on the IB WS
Important Vocab TermsElectrostatic force - the force that occurs when a
+ charge is attracted to a - charge (causes the bonds!)
Salt- another name for ionic compounds
Formula unit- One molecule of an ionic compound
Ionic Compounds Electrostatic attraction between formula
units create a stable structure
“Crystal Lattice”- formula units, which repeat in a geometric pattern.
NaCl
Properties of Ionic Compounds
1. Crystalline solids at room temperature2. Have very high melting and boiling points3. Conduct electricity when in a molten state (or
dissolved in water)
Warm Up:How many atoms of each element in the following
compounds??
NaClCaCl2Na3PO4
Ca(NO3)2
Al2(SO4)3
Now you practice!!
How do I calculate Molar Mass?
1. Determine the number of atoms of each element.
2. Multiply by the atomic mass.3. Add’m Up
Ionic Bonding Cut and Paste Activity
1. Color the cations one color and the anions another.
2. Build the neutral compounds.3. Remember your + charges need to
equal the - charges.4. Name the compounds!
Ionic Bonding with Polyatomic Ions
Polyatomic Ions- A group of covalently bonded atoms that have a charge.
The charge is attracted to the charge on a metal to form an ionic bond.
Polyatomic Ion Rap