1. ELEMENTS AND
COMPOUND
THE PERIODIC
TABLE OF
ELEMENTS

2. Compounds/Elements
 Like mixtures, compounds are also made up of
two or more components.
 These components are called elements
 Combination of two or more elements
 Molecule- smallest unit of a compound
 Atom- smallest unit of an element
 Elements are indivisible; cannot be divided into
smaller part
 Compounds can be separated into its component
chemically.

3. Compounds/Elements
Compounds are made up of
elements.
Elements are the simplest form
of matter.
Both elements and compounds
are substances.

4. Water Electrolysis
 A process to separate the components
of water from each other through a
passage of electric current.
 Hydrogen- highly reactive colorless
gas, lightest element, explodes with a
spark
 Oxygen- colorless and odorless gas,
most abundant element, supports
combustion

5. Periodic Table of Elements
 What’s in the name?
 Scientists agreed to give symbols for each
element. This is very helpful especially to
those elements with long names. Instead of
writing the full names, a one-letter or two-
letter symbol may be used. You can find
these symbols in the periodic table too. It is
written inside the same box for that element.
For instance, O is the symbol for oxygen.

6. Family or Group
 Elements that are in the same column
tend to have similar properties. For
this, each column is called a family
and has a family name. However, at
this point, you will refer first to each
family with their corresponding group
number. Notice that the columns are
numbered 1 to 18 from left to right.