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The Periodic Table
Revision Notes by Susan…read more

Slide 2

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The early periodic table
· Newlands: made law of octaves
· Arranged them based on the properties that every 8th
element seemed similar
· FAILED because he didn't leave gaps for elements that
hadn't been discovered yet
· He assumed that all the elements were discovered
· He was so keen on filling his table, he filled in his
octaves even though some of the elements did not have
similar properties at all
· Also put two elements in the same place just to make
things fit…read more

Slide 3

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Mendeleev and the new periodic
· 50 elements had been discovered when he
came up with the new periodic table
· Left gaps for the elements that hadn't been
found yet, guess these elements properties from
his table, and when these elements were found
they fitted his predictions
· Arranged them in atomic mass and in periodic
pattern to show similar chemical and physical
properties…read more

Slide 4

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The modern periodic table
· Arranged in atomic (proton) number
· Chemical properties depend on the
number of electrons in the highest energy
level of an atom
· REMEMBER: Mendeleev table organised
in relative atomic masses, today they are
arranged in atomic (proton) number…read more

Slide 5

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Q: Why is the periodic table not
placed in according to their relative
atomic mass?
· If placed in their relative atomic mass, most elements would be put into a
group in which they all have similar chemical reactions, however this doesn't
work for all elements
· E.g. Argon and Potassium
Argon has atomic mass 40 and Potassium has atomic mass 39. Argon is a
noble gas. Potassium is an alkali metal. Totally different elements. But if
group in similar atomic mass, they would be in the same group, meaning the
noble gas is grouped with highly reactive alkali metals. These elements
cannot be put in according to relative atomic mass.
A: Although elements would be put into groups with similar chemical
reactions, these elements would be of complete different physical
characteristics. Now explain argon and potassium.…read more

Slide 6

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Modern periodic table groups
· Group 1 + 2 (left)= Reactive metals
· Middle metals = Transition metals
· Group 3 to 7 metals: Non metals
· Group 0 metals (right) = Noble gases
· Run To Ned's Noodle!
Reactive metals Transition metals Non metals Noble Gases
·React violently to ·Basically metals ·Low melting ·Non-metal
oxygen/ chlorine/ water we think of, like and boiling elements
iron, steel, copper, points ·Very
·All soft: can be cut with silver gold
knife ·Most are unreactive
·Contains all the liquid/gas at
·Difficult to get
magnetic metals room
them to
combine with
other elements…read more

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