ELEMENTS, CHEMICAL SYMBOLS,

1
ELEMENTS, CHEMICAL SYMBOLS, CHEMICAL FORMULAS
Textbook pages 660-661 (periodic table) Page 23
and 79
2
All elements can be represented by a CHEMICAL
SYMBOL.
CHEMICAL SYMBOLS are either ONE UPPERCASE
LETTER OR ONE UPPERCASE ONE LOWERCASE LETTER
3
Some Common Chemical Symbols

• Hydrogen - H
• Oxygen - O
• Nitrogen -N
• Carbon - C
• Potassium -

• Silicon - Si
• Aluminum - Al
• Iron - Fe
• Magnesium - Mg
• Calcium -
• Sodium -

Use your textbook (p.660-661) to find the missing
symbols!
4
Two or more atoms of different elements can
combine to form a COMPOUND.

• Compounds can be represented by
• CHEMICAL FORMULAS
• Water - H2O
• Carbon Dioxide - CO2
• Sodium Chloride (table salt) - NaCl
• Rust - Fe2O3
• Sugar - C12H22O11

5
Each element in a chemical formula is represented
by its CHEMICAL SYMBOL.
NaCl
Sodium(Na)
Chlorine(Cl)
Sodium Chloride (table salt)
6
The number of atoms of each type of element in
the compound (other than 1) is represented by a
small number (subscript) to the RIGHT of each
chemical symbol.
RememberNO number 1 atom. )
NaCl 1 atom of Na 1 atom of Cl H2O 2 atoms
of H 1 atom of OFeS2 1 atom of Fe 2 atoms
of SNH3 __ atom(s) of N __ atom(s) of
HNaCO3 __atom(s) of Na __atom(s) of C
__atom(s) of O
7
A limited number of elements comprise the largest
portion of the solid Earth, living matter, the
oceans, and the atmosphere

• Nitrogen
• Carbon
• Hydrogen
• Oxygen
• Sodium

• Silicon
• Aluminum
• Iron
• Calcium
• Chlorine

8
Match each group of elements with the places on
our planet where they are found most. Use page
23 in your textbook!

• 1. Earths Crust
• 2. Atmosphere
• 3. Living Things
• 4. Ocean

• A. Carbon, hydrogen, oxygen, nitrogen
• B. Hydrogen, oxygen, sodium, Chlorine
• C. Oxygen and Nitrogen
• D. Oxygen, Silicon, Aluminum, Iron, Calcium

9
Match each group of elements with the places on
our planet where they are found most. Use page
23 in your textbook!

• 1. Earths Crust
• Oxygen, Silicon, Aluminum, Iron, Calcium
• 2. Atmosphere
• C. Oxygen and Nitrogen

• 3. Living Things
• A. Carbon, Hydrogen, Oxygen,Nitrogen
• 4. Ocean
• B. Hydrogen, Oxygen, Sodium, Chlorine

10
FOLDABLE Use your notes and vocabulary