Do now!
Can you think of the
names of 5 elements,
and 5 compounds??
Last lesson
• Know that there is a huge variety of
materials.
• Know how many different elements there
are.
• Know that all materials are made of
elements combined together.
• Know some of the properties of elements.
Atoms
Everything on your list is made of atoms
Atoms are VERY small!
If you write a full stop using a pencil, it
contains about 10 000 000 000 000 atoms.
.
A few different types
However, there are only about 113
different types of atom
Element
A substance that only contains ONE type
of atom is called an element
Gold
Gold is an element because it only
contains ONE type of atom (gold atoms)
Oxygen
Oxygen is an element because it only
contains ONE type of atom (oxygen
atoms)
Iodine
Iodine is an element because it only
contains ONE type of atom (Iodine atoms)
Water
Water is NOT an element because it
contains more than one type of atom
Today’s lesson
• Know the names of some chemical
elements
• Know how to write chemical symbols for
elements correctly
Symbols
Symbols
• If one letter, a capital
Symbols
• If one letter, a capital
• If two letters,
capital and lower case
Symbols
• If one letter, a capital
• If two letters,
capital and lower case
WHY?
Cobalt Co
Carbon Monoxide CO
Lithium Li
Lithium Iodide LI
Wo
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•
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Element : Woman
Symbol : Wo
Atomic mass : Accepted as 53.6 kg may vary from 40 – 200 kg
Occurrence : Copious quantities in all shopping malls
Physical properties :
1. Surface usually covered in painted film
2. Boils at nothing, freezes without any known reason
3. Melts if given special treatment
4. Bitter if incorrectly used
Chemical properties :
1. Has great affinity for gold, silver and a range of precious stones
2. Absorbs great quantities of expensive substances
3. May explode spontaneously without prior warning and for no known reason
4. Insoluble in liquids, but activity greatly increases by saturation in alcohol
Common uses :
1. Highly ornamental, especially in sports cars
2. Very effective cleaning agent
Test :
1. Pure specimen turns rosy pink when discovered in natural state
2. Turns green when placed beside a better specimen
Potential hazards :
1. Highly dangerous except in experienced hands
2. Illegal to posses more than one, although several can be maintained at different locations as
long as specimens do not come into direct contact with each other.
Your own element?
• On the card provided, make up your own
interesting element!
• Include name, symbol, appearance,
properties, reactions, uses etc.
Symbols
• If one letter, a capital
• If two letters,
capital and lower case
Can you
copy this
please?