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C3a…read more

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Periodic Table ­ Newlands Law of
· The periodic table was called periodic table
because elements came up in regular intervals
· In the 1800s the periodic table was determined by
atomic mass
· Then later on in the 20th century by atomic weight
and chemical properties
· A man called Newlands started off the periodic
· He sorted though that every eighth element has
similar properties, This was called the Law of
Octaves…read more

Slide 3

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Periodic Table ­ Newlands Law of
· This problem with his table was that
· He didn't leave any gaps
· He mixed metals and non metals
· He put two elements in the same box
· He put elements together which didn't have
the same chemical properties…read more

Slide 4

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Periodic Table ­ Dmitri Mendeleev
· Mendeleev was the second best effort into
sorting the periodic table
· He left gaps for undiscovered elements
· He arranged elements by atomic mass
· He ordered elements in groups and periods…read more

Slide 5

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The Modern Periodic Table
· The periodic table is based on atomic
structure and chemical properties
· It is ordered by proton number in periods and
electron number in groups
· Shielding is when there are many inner energy
levels covering the nucleus which reduces
forces of attraction…read more

Slide 6

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Group 1 ­ The Alkali Metals
· These are very reactive and have a low melting and
boiling point
· The make ionic bonds with non metals forming a +1
· The first three are Lithium, Sodium and Potassium
· One outermost electron
· React with water and hydrogen gas is given off
· You can do a flame test to see what colour flame each
alkali metal ion produces:
· Lithium = Red
· Potassium = Lilac
· Sodium = Yellow…read more

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