Pages in this set

Page 1

Preview of page 1
C4- Atomic Structure

At the centre of an atom is a nucleus
containing protons and neutrons. Electrons
are arranged around the nucleus in energy
levels or shells. Make sure you can label a
simple diagram of an

Important Facts

Neutrons are neutral 0
Electron are negatively charged -1
Protons are…

Page 2

Preview of page 2
what are they?
Isotopes are atoms with the same number of protons and electrons, but differ in the
number of neutrons, therefore they have a different mass.
Some examples......

Isotopes of Hydrogen

Isotope Protons Electrons Neutrons

1 1 1-1=0

1 1 2-1=1

1 1 3-1=2

Isotopes of Chlorine


Page 3

Preview of page 3
Energy Shells and Electronic structure
Electrons are arranged in different shells around the nucleus
Each shell has a different capacity of the number of electrons it can hold, we can see that
from this table

Energy shell Maximum number of electrons

First 2

Second 8

Third 8

If an atom…

Page 4

Preview of page 4


No comments have yet been made

Similar Science resources:

See all Science resources »