Download PEN numbers - Noadswood Science

Starter Questions
1. Where are the metals found in the periodic
table?
2. Where are the non-metals found in the
periodic table?
3. What are the group 1 metals called?
4. What is the name of the block of metals
between group 2 and group 3?
5. What are the group 7 non-metals called?
6. What are the group 8 (0) non-metals called?
Wednesday, 24 May 2017
PEN numbers
L.O: To know the structure of an
atom and how to work out PEN
numbers
The structure of the atom
The Ancient Greeks used to believe that
everything was made up of very small particles. I
did some experiments in 1808 that proved this
and called these particles ATOMS:
Dalton
ELECTRON –
negative, mass
nearly nothing
NEUTRON –
neutral, same
mass as
proton (“1”)
PROTON –
positive, same
mass as
neutron (“1”)
The structure of the atom
Particle
Proton
Relative Mass
1
Relative Charge
+1
Neutron
Electron
1
0
0
-1
MASS NUMBER = number of
protons + number of neutrons
SYMBOL
PROTON NUMBER = number of
protons (obviously)
Subatomic
What does the periodic table tell you?
Atomic Mass
(Number of
Proton and
Neutrons)
Proton Number
(Number of
Protons )
This is also
usually the same
as the number
of electrons
PEN numbers
How many protons, electrons and neutrons?
1 proton
5 proton
8 proton
1 Electron
5 Electron
8 Electron
0 Neutron
6 Neutron
8 Neutron
11 proton
17 proton
92 proton
11 Electron
17 Electron
92 Electron
12 Neutron
18 Neutron
146 Neutron
Discovery of atomic structure
What is a theory?
A theory is a suggestions which
could explain why something is
happening or why something is
observed. It is not a guess or a
fact.
Theories can be changed if better
evidence is available.
The greenhouse effect is a theory
about why global warming is
occurring. But there are other
theories!
These apples keep
falling to the ground.
Perhaps there is a force
pulling them –
”gravity”?