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A History of the Periodic
Table…read more

Slide 2

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The Early Periodic
Dobereiner John Dalton John Newlands Dmitri Mendeleev
19th Century 19th Century 19th Century 19th Century…read more

Slide 3

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In 1829, he put some of
the elements into groups
of three (known as triads).
The elements in his triads
had similar chemical and
physical properties.…read more

Slide 4

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During the 19th Century, new elements we being
discovered almost every year. Chemists were
trying to find patterns in the properties and
behaviour of the elements, as this would allow
them to acquire more knowledge about chemistry.
One of the first suggestions came from John
Dalton who arranged the elements in order of their
Dalton…read more

Slide 5

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In 1864, John Newlands
developed on Dalton's ideas
using a `law of octaves'
(octave means eight). After
arranging all the know
elements in order of mass,
he noticed that every eighth
element had similar
properties. However, this
John Newlands pattern fell apart when he
reached calcium. Other
scientists made fun of his
ideas and wouldn't accept
them.…read more

Slide 6

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In 1869, Dmitri Mendeleev made the breakthrough that
would change chemistry forever. Mendeleev arranged
the 50 known elements in a table, and placed them in
order of their atomic weights. He arranged them in a
way so that he could see a regular pattern in their
properties. What made his idea revolutionary was that
he thought to put gaps for undiscovered elements.
Using his table, he was able to predict what the
properties of missing elements could be. A few years
later, elements were discovered that closely matched…read more

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