Chapter 6 Section 3
Pg. 170-175
Describing Ionic Compounds
• The name of an _____ compound must
distinguish the compound from other ionic
compounds containing the same elements.
The _______ of an ionic compound describes
the _____ of the ions in the compound.
Describing Ionic Compounds
• Binary Ionic Compounds
– A compound made from only __ elements is a
binary compound
• Bi- means 2
– The names have a predictable patter:
• The name of the ______ (+) followed by the name of
the anion (-)
• Name for cation is the name of the _____ without any
change
• Name for the _____ uses part of the name of the
nonmetal with the suffix –ide
Describing Ionic Compounds
• Binary Ionic Compounds
Common Anions
Element
Name
Ion Name
Ion Symbol
Ion Charge
Fluorine
Fluoride
F-
1-
Chlorine
Chloride
Cl-
1-
Bromine
Bromide
Br -
1-
Iodine
Iodide
I-
1-
Oxygen
Oxide
O2-
2-
Sulfur
Sulfide
S2-
2-
Nitrogen
Nitride
N3-
3-
Phosphorus
Phosphide
P3-
3-
Describing Ionic Compounds
• Metals with Multiple Ions
– ______ metals, alkaline earth metals, and
aluminum form ions with ________ charges equal
to the group number
• Potassium ion is K+
• Aluminum ion is Al3+
– Many _________ metals form more than one type
of ion
• When a metal forms more than one ion, the name of
the ion contains a _____ numeral to indicate the charge
on the ion
Describing Ionic Compounds
• Metals with Multiple Ions
Some Metal Cations
Ion Name
Ion Symbol
Ion Name
Ion Symbol
Copper (I)
Cu+
Chromium(II)
Cr2+
Copper(II)
Cu2+
Chromium(III)
Cr3+
Iron(I)
Fe+
Titanium(II)
Ti2+
Iron(III)
Fe3+
Titanium(III)
Ti3+
Lead(II)
Pb2+
Titanium(IV)
Ti4+
Lead(V)
Pb5+
Mercury(II)
Hg2+
Describing Ionic Compounds
• Polyatomic Ions
– A __________ bonded group of atoms that has a
positive or negative charge and acts as a unit
(one)
– Poly- means “____”
– most simple polyatomic ions are anions
Describing Ionic Compounds
• Polyatomic Ions
– 1 Nitrogen and 4 Hydrogen atoms
– Called an ________ ion
– Joined by covalent bonds
– ________ charge because: N has 7 protons, each
H atom has 1 proton= 11 total; but the group only
has 10 electrons to _______ the charge on the
protons – 8 v.e. and N 2 inner electrons
Describing Ionic Compounds
• Polyatomic Ions
Some Polyatomic Ions
Name
Formula
Name
Formula
Ammonium
NH4+
Acetate
C2H3O2-
Hydroxide
OH-
Peroxide
O2-
Nitrate
NO3-
Permanganate
MnO4-
Sulfate
SO42-
Hydrogen sulfate HSO4-
Carbonate
CO32-
Hydrogen
carbonate
HCO3-
Phosphate
PO43-
Hydrogen
phosphate
HPO42-
Chromate
CrO42-
Dichromate
Cr2O72-
Silicate
SiO32-
Hypochlorite
OCl-
Describing Ionic Compounds
• Writing Formulas for Ionic Compounds
– IF you know the name of an _____ compound,
you can write its formula
• Place the symbol of the ______ first, followed by the
symbol of the anion
• Use subscripts to show the _____ of the ions in the
compound, all compounds are neutral
– Total charges on the cations and anions must add
up to ____
Practice Writing Formulas
for Ionic Compounds
Describing Molecular Compounds
• The name and formula of a molecular
compound ________ the type and number of
atoms in a molecule of the compound
• Naming Molecular Compounds
– General rule: the most ________ element appears
first in the name (farther left on table), if both
elements are in the same group, the more metallic
element is closer to the bottom of the _____
– The name of the second element is changed to ___ in
the suffix -ide
Describing Molecular Compounds
• Prefixes for naming compounds
Number of Atoms
Prefix
1
Mono-
2
Di-
3
Tri-
4
Tetra-
5
Penta-
6
Hexa-
7
Hepta-
8
Octa-
9
Nona-
10
Deca-
Practice Naming Molecular
Compounds
Describing Molecular Compounds
• Writing Molecular Formulas
– Write the _______ for the elements in the _____
the elements appear in the name
– Prefixes indicate the ______ of atoms of each
element in the molecule
• Appear as subscripts in formula
• If there is no ______ for an element in the name, there
is only one atom of that element in the ________
Practice Writing Molecular Formulas
• Formula for diphosphorus tetrafluoride
– Phosphorus- P, di=2
– Fluoride- F, tetra=4
______