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Chemistry
Paper 1
The Periodic Table
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Cards (7)
How is the modern Periodic Table ordered?
By
atomic number
How were the early lists of elements ordered?
By
atomic mass
Why did Mendeleev swap the order of some elements?
To group them by their
chemical properties
Why Mendeleev leave gaps in his Periodic Table?
To
leave room
for elements that had
not
yet been
discovered
Why do elements in a group have similar chemical properties?
because they have the
same number
of
electrons
in their
outer shell
Where are metals and non-metals located on the Periodic Table?
Metals
are to the
left
and
non-metals
to the
right
What name is given to a group 1 elements?
They are metals that react with
water
to form an
alkali.