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Title: elements and atoms
Description: thi is a presentation of elements and atoms and what they are made of
Description: thi is a presentation of elements and atoms and what they are made of
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KS3 Chemistry
8E Atoms and
Elements
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© Boardworks Ltd 2005
2004
Contents
8E Atoms and Elements
What are atoms and elements?
Symbols for elements
Elements in the periodic table
Making compounds
Chemical reactions
Summary activities
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© Boardworks Ltd 2005
2004
How many different substances are there?
How many
different substances
can you think of?
There are millions of different substances!
What are they all made of?
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© Boardworks Ltd 2005
2004
All substances are made of atoms
All substances are made of very tiny particles called atoms
...
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hydrogen and
oxygen atoms
carbon and
hydrogen atoms
iron, aluminium,
silicon, oxygen
and boron atoms
carbon, nitrogen,
hydrogen, oxygen
and sulphur atoms
© Boardworks Ltd 2005
2004
What is an element?
All substances are made of very tiny particles called atoms
...
These are the elements
...
The elements are the building blocks of all other substances
...
Copper is an
element made up of
copper atoms only
...
Helium is an
element made up of
helium atoms only
...
In some elements, the atoms are joined in groups of two or
more
...
Oxygen is an
element made up of
oxygen atoms only
...
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7
© Boardworks Ltd 2005
2004
Contents
8E Atoms and Elements
What are atoms and elements?
Symbols for elements
Elements in the periodic table
Making compounds
Chemical reactions
Summary activities
1 of 36
20
8
© Boardworks Ltd 2005
2004
Introducing chemical symbols
A standard set of symbols is used to represent elements:
The symbol for many of the more common elements uses
just the first letter of the name
...
Li = lithium
Al = aluminium
He = helium
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O = oxygen
N = nitrogen
I = iodine
Some of the symbols are not
always as you might expect
...
1
...
e
...
N (not n) for nitrogen
2
...
e
...
Co (not CO) for cobalt
No, Watson! It was
carbon monoxide
poisoning – not cobalt
...
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Relative: sulphur, oxygen, nitrogen
SON
3
...
Group of fish: sulphur, hydrogen, oxygen,
aluminium
SHOAl
5
...
Combining the symbols of the atoms
in a molecule gives you the formula of the molecule
Title: elements and atoms
Description: thi is a presentation of elements and atoms and what they are made of
Description: thi is a presentation of elements and atoms and what they are made of