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The first periodic table
In the 1800's, when they
had not yet discovered
protons or electrons, they
could only measure
relative atomic mass. So
this is what they did.
They arranged the
known elements in the
periodic table in order of
atomic mass. When this
was done, a pattern in
the properties of the
elements...…read more

Slide 3

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Newlands' Law of
I man called Newlands was first to create the first good periodic
table by arranging the elements more usefully. He did this in 1864.
He noticed a pattern. Every 8th element
telluric helix had similar properties.
So he put the elements in rows of 7 so that every 8th element was
beneath each other, Like so:…read more

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Newland's Law of Octaves
These sets if 8 were called Newlands' Octaves. But there was a
problem when it came to the third row, as the transition metals
like titanium and iron kept messing up!
Although he left no gaps in his table, and this is why his work
was ignored. Although he was pretty close to getting it right.
He took his work and presented it to the Chemical Society in
1865. But it was criticised because; he mixed metals with none
metals, such as oxygen and iron. He left no gaps for
undiscovered elements, so there was no way of adding to it, and
it contained elements that didn't have similar properties such as
carbon and titanium.…read more

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Dimitri Mendeleev
In 1869, Dimitri Mendeleev, with about 50 elements, created a new
arrangement for them, in a new Table of Elements.
Dimitri put them in…read more

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