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Slide 1

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Chemistry 3a
The Periodic Table…read more

Slide 2

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History of the Periodic Table
· In the early 1800's the known elements were arranged in order of
atomic mass
· When this was done, a periodic pattern was noticed in the properties
of the elements which is why it is called the Periodic Table…read more

Slide 3

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· Newlands noticed that every eighth element had similar properties
and so listed some of the known elements in rows of seven
· ^They were Newlands' Law of Octaves
· However, the pattern broke down on the third row because some
transition metals messed it up
· His work was ignored…read more

Slide 4

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His work was criticised because:
· His groups contained elements that did not have similar properties,
for example carbon and titanium
· He mixed up metals and non-metals,
for example iron and oxygen
· He didn't leave any gaps for elements that had not yet been
discovered…read more

Slide 5

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· Mendeleev also put elements in order of atomic mass, however he
found he had to leave gaps in order to keep elements with similar
properties in the same groups
· He was then able to predict the properties of the undiscovered
elements…read more

Slide 6

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Once there was more evidence,
scientists realised the periodic table
could be a useful tool for predicting
properties of elements…read more

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Slide 10

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