Unit 3 Lesson 1
Chemical Bonding
Objectives
Recognize that the properties of compounds differ from their
constituent elements and provide examples.
Explain how compounds are formed by combining two or more
different elements.
Describe how the arrangement of electrons affects the
formation of ionic and covalent compounds.
A compound is a substance that is made
from more than one element.
atom
A compound made up of
2 different elements
atom
A compound made up of
7 different elements
A compound can be broken down into
elements
An element
A compound made up of 3
different elements
An element
An element
Material
Made up of:
Water
Hydrogen and Oxygen
Coal
Carbon
Carbon dioxide Carbon and Oxygen
Oxygen
Oxygen
Chalk
Calcium, Carbon &
Oxygen
Wax
Carbon & Hydrogen
Table salt
Sodium & Chlorine
Caffeine
Carbon, Hydrogen,
Nitrogen & Oxygen
Element or
compound
Material
Element or compound
Water
Compound
Coal
Element
Carbon dioxide
Compound
Oxygen
Element
Chalk
Compound
Wax
Compound
Table salt
Compound
Caffeine
Compound
The Periodic Table is a useful way to arrange elements.
The vertical columns are called groups.
The horizontal rows are called periods.
Elements in the same group have similar properties.
Three quarters of the elements are metals.
One quarter of the elements are non-metals.
The Periodic Table
Q1. The symbol of Nitrogen is:
a. Na
b. N
Q2. Hg is the symbol of:
a. Hydrogen
b. Helium
c. Ni
c. Mercury
Q3. The percentage of metals in the periodic table is:
a. 75%
b. 50%
c. 25%
Q4. Water is not in the periodic table because:
a. It is a liquid substance
b. It is a natural substance
c. It is a compound not an element
The Periodic Table
Q1. The symbol of Nitrogen is:
a. Na
b. N
Q2. Hg is the symbol of:
a. Hydrogen
b. Helium
c. Ni
c. Mercury
Q3. The percentage of metals in the periodic table is:
a. 75%
b. 50%
c. 25%
Q4. Water is not in the periodic table because:
a. It is a liquid substance
b. It is a natural substance
c. It is a compound not an element
Rule 1: When two elements combine
the ending is usually ” ……………ide”.
metal goes first
Sodium Chloride
Magnesium Oxide
Iron Sulphide
Cl
Na
Mg
Fe
O
S
Rule 2: When three or more different
elements combine and one of them is
Oxygen, the ending will be “………ate”.
metal goes first
O
O
Cu
Copper Sulphate
S
O
O
Calcium Carbonate
O
Ca
C
O
O
Rule 3: When two identical elements
combine, the name does not change.
H2 = Hydrogen
F2 = Fluorine
H
F
F
N
N2 = Nitrogen
Cl2 = Chlorine
O2 = Oxygen
H
Cl
N
Cl
O
O
Name the following compound
ZnO
Name the following molecule
H2
Name the following compound
MgCl2