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History of the periodic table
The periodic table has gone though a lot of changes to get to its
modern form. At first elements were put into groups of three known
as triads. They all have similar chemical and physical properties.
During the 19th Century, new elements we being discovered, so a
new table was designed with elements being arranged in order of
there masses. After all the elements were arranged in order of
mass, John Newlands noticed that every eighth element had
similar properties. However, this pattern fell apart when he reached
calcium. Other scientists made fun of his ideas and wouldn't accept
them. After him another scientist called 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 Mendeleev's predictions. People then
believed that his table was an amazing discovery for the world of
chemistry. He is now remembered as the father of the modern…read more

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The Periodic Table
The modern periodic table contains 18
groups of vertical columns.
The elements in these columns all have
similar properties and characteristics. This
is because they have the same number of
outer electrons.…read more

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Alkali Metals
Properties:
They have low melting and boiling points
compared to most other metals
They are very soft and can be cut easily with a
knife
They have low densities (lithium, sodium and
potassium will float on water)
They react quickly with water, producing
hydroxides and hydrogen gas
Their hydroxides and oxides dissolve in water to
form alkaline solutions…read more

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Alkaline Earth Metals
· Have a shiny, silvery-white colour.
· Highly reactive
· All found in the earth's crust
· Radium is radioactive
· Harder and denser than group 1 elements
· Higher melting points than group 1 elements…read more

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Halogens
Properties:
they are non-metals
they have low melting and boiling points
they are brittle when solid
they are poor conductors of heat and electricity
they have coloured vapours
their molecules each contain two atoms (they
are diatomic)…read more

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