Download C3 The Periodic Table

Lessons 1-5
C3 The Periodic Table
What can the modern periodic table
tell us?
Starter:
On the periodic table in front of you, annotate everything you know
about what it tells you.
e.g. Group 1 = alkali metals.
Think about – order of reactivity, names of groups/sections, what the
numbers tell you about atoms, what the symbols tell you, size of
atoms…. Etc.
Glossary
• Element – a substance made of 1 type of atom
that cannot be broken down into anything
chemically simpler.
• Periodic table – an arrangement of elements
in the order of their atomic numbers, forming
groups and periods.
Who made it and how?
• The old periodic table was rubbish – it was poorly
ordered (based on patterns of behaviour, then on
mass) and made little sense.
• In 1964 Newlands attempted to put it in a sensible
order by mass and saw similarities between every 8th
element .
• Mendeleev ordered the elements based on their
atomic weights and arranged them so there was a
pattern.
• He left GAPS because he predicted new elements
would fit in, as they were discovered. He was right!
The Modern Periodic Table
Protons and neutrons were discovered in the 20th
century.
Elements are now arranged in terms of proton number.
They increase by 1 each time. Check out the PT!
• It could also be seen as being arranged in terms of
electronic structure.
Within a group elements have similar properties.
• Check out the alkali metals.
To Recap
1) What does an atom look like?
2) what do the numbers mean?
3) What is the electronic structure?
Labels to include
Group 1-8
Name Alkali metals, (reactive metals – group 1
and 2) Halogens, Nobel gases.
Number of electrons in outer shells
Metals and non metals
Transition metals
Draw electron shells for group 1 and 7
Properties of some elements
• Use the worksheet and the pages noted to
make a fact sheet about the properties of the
alkali metals, transition metals and halogens.
Other Things of Interest
• http://www.youtube.com/watch?v=Mx5JJWI2
aaw
• Reaction of alkali metals and Halogens
1) Displacement reactions of halogens
• A more reactive halogen will displace a less reactive
one from solutions.
e.g.
Chlorine + potassium bromide  potassium chloride + bromine.
Chlorine is MORE reactive that bromine so boots it
out of the way.
Complete the following with either the
correct chemicals or “no reaction”.
Fluorine + potassium chloride 
Bromine + sodium chloride 
Iodine + lithium bromide 
Chlorine + ……………………  potassium fluoride + ……………