OB: to review the properties of
metals, nonmetals, ionic
compounds, and then…
Polyatomic Ions
Take out your reference tables and
some paper for some notes.
Define the Properties…
Luster
Ductile
Malleable
Conducts electricity
Conducts heat
Phase at room temp
Forms Cations?
Forms Anions?
Relative Melting point
Particle (atom, molecule, FU)
Property
Luster
Ductile
malleable
Conducts electricity
Conducts heat
Phase at room temp
Forms cations?
Forms anions?
Relative melting point
particles
Metals
Nonmetals
Ionic compounds
Property
Metals
Nonmetals
Ionic compounds
Luster
Yes
No
No
Ductile
Yes
No
No
Malleable
Yes
No
No
Conducts electricity
Yes
No
No
Conducts heat
Yes
No
No
Phase at room temp
Solid
Solid, liquid, gas
Solid
Forms cations?
Yes
No
X
Forms anions?
No
Yes
X
Relative melting point
High
Lowest
Highest
Particles
Atoms
Atoms or
diatomic molecules
Formula units
All of our polyatomic ions will be found on table E on the front page of the reference tables
They are multiple groups of atoms, acting as a single unit, with a charge, as an ION.
Most are anions, but the first few are cations.
Ammonium is common, the other 2 cations are much less common.
The anions are all equally common in our course.
Never change their names, ever.
Some are similar in formula (sulfite and sulfate) but very different in name. Be careful.
Lots have fun names to say out loud. Let’s say some now.
When naming the ionic compounds, we always say the cation first, then the anion.
These polyatomics can readily combine with the monoatomic ions from the periodic table.
Cations
Anions
Li+1
CO3-2
Mg+2
ClO3-1
Compound
formula
CaCrO4
SrCr2O7
NH4+1
OH-1
Names
Cations
Anions
Compound
formula
Names
Li+1
CO3-2
LiCO3
Lithium carbonate
Mg+2
ClO3-1
MgClO3
Magnesium chlorate
Ca+2
CrO4-2
CaCrO4
Calcium chromate
Sr+2
Cr2O7-2
SrCr2O7
Strontium dichromate
NH4+1
OH-1
NH4OH
Ammonium hydroxide
Cations
Anions
Compound formula
Names
Ammonium
oxalate
Ammonium
Phosphide
Cesium
sulfate
Cesium
sulfite
Barium
thiocyanate
Cations
NH4
Anions
+1
C2O4
NH4+1
P-3
-2
Compound formula
Names
(NH4)2C2O4
Ammonium
oxalate
(NH4)3P3
Ammonium
Phosphide
Cs+1
SO4
-3
Cs2SO4
Cesium
sulfate
Cs+1
SO3-3
Cs2SO3
Cesium
sulfite
Ba+2
SCN-1
Ba(SCN)2
Barium
thiocyanate
Cations
Anions
Compound
formula
(NH4) 2SO4
NH4HCO3
NaCN
KOH
Ba(SCN) 2
Names
Cations
NH4
+1
Anions
SO4
-3
Compound
formula
Names
(NH4) 2SO4
Ammonium
sulfate
NH4+1
HCO3-1
NH4HCO3
Ammonium
hydrogen
carbonate
Na+1
CN-1
NaCN
Sodium cyanide
K+1
OH-1
KOH
Potassium
hydroxide
Ba+2
SCN-1
Ba(SCN) 2
Barium
thiocyanate
Cations
Anions
Na+1
C2H3O2-1
Ca+2
MnO4-1
Sr+2
O2-2
Al+3
MnO4-1
Be+2
PO4-3
Compound
formula
Names
Cations
Anions
Compound
formula
Names
Na+1
C2H3O2-1
NaC2H3O2
Sodium acetate
Ca+2
MnO4-1
Ca(MnO4)2
Calcium
permanganate
SrO2
Strontium
peroxide
Al(MnO4)3
Aluminum
permanganate
Be3(PO4)2
Beryllium
phosphate
Sr+2
Al+3
Be+2
O2
-2
MnO4-1
PO4
-3