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The early periodic table
For many years scientists had been
struggling to come up with patterns in the
elements. English chemist, John
Newlands, arranged the first twenty
elements in an order ­ his law of octaves.
However, a pattern couldn't be found for
all the elements.
Mendeleev arranged the elements in
order of relative atomic mass.
He realised that the physical and
chemical properties of elements were
related to their atomic mass in a
'periodic' way, and arranged them so
that groups of elements with similar
properties fell into vertical columns in
his table…read more

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The early periodic table
The early periodic tables was incomplete.
The method which Mendeleev
used to arrange his elements
meant that they were gaps in
his horizontal rows. However
instead of seeing this as a
problem he simply thought it
meant that the elements
which belonged had not been
discovered. He was also able
to work out the atomic mass of
the missing elements, and so
predict their properties.
Once there was more evidence , many more scientists realised the
periodic table could be more useful tool for predicting properties.…read more

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The Modern Periodic
The proton was Table
The neutron The electron
discovered by was discovered was
Ernest by James discovered by
Rutherford. Chadwick J.J Thompson…read more

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Arrangement of the periodic
Reading from left to For example: When all the elements were
right, the periodic Hydrogen has 1 arranged, then the elements
table was arranged proton, helium has were placed into appropriate
in increasing atomic 2 protons, lithium groups e.g. Group 1 & 2 are
number (protons ) has 3 protons and metals and group 8 are noble
so on... gases…read more

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When electrons, protons and neutrons were discovered the periodic
table was arranged in order of atomic number. All elements were put
into groups.
Using the electron arrangement of the element you can predict the
elements chemical properties
Apart from transition metals, elements
in the same group have the same
number of electrons in their highest
occupied energy level(outer shell)
The group number is equal to the
number of electrons in the highest
occupied energy level…read more

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