C2

How did John Dalton organise elements?
In order of their atomic weights
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How did John Newlands organise elements?
In order of mass but noticed the properties of every eighth element seemed similar
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How did Mendeleev organise the elements?
Atomic weights and a pattern in properties could be seen.
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Why did scientists think Mendeleev's discovery was a scientific breakthrough?
Because he left gaps for elements and predicted their properties. A few years later his predictions closely matched the real elements
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What group are the noble gases?
Group 0
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What do atoms of metals tend to do?
Lose electrons
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What do atoms of non-metals tend to do?
Gain electrons
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Why are group 0 gases unreactive?
Because of their electron arrangements
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What are group 1 elements called?
Alkali metals
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What is the pattern for melting and boiling points in group 1?
It decreases as you go down the group
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Why do alkali metals have to be stored in oils?
To stop them from reacting with oxygen in the air
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Why does the shiny silvery surface of an alkali metal turn dull when mixed in air?
It is oxidising with the oxygen in the air
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Why are alkali metals really reactive?
They have one electron they want to get rid of
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When you add an alkali metal to water why does it float and fizz?
Because the metal reacts with water to form hydrogen gas
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What forms when alkali metals react with water?
H+ ions to make ionic compounds. These are generally white and dissolve in water, giving colourless solutions
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What are group 7 elements called?
Halogens
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What is the pattern for mp and bp in halogens?
Increase as you go down the group
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What is the pattern for reactivity in halogens?
They get less reactive as you go down the group
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What will a more reactive halogen do to a less reactive halogen?
Displace it from solutions of its salts
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The number of shells increases as you go down the periodic table, what effects does this have?
Larger atoms lose electrons more easily, larger atoms gain electrons less easily
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What does the electrostatic attraction depend upon?
Distance between outer electrons and nucleus, No of shells and size of positive charge
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What are transition metals?
Metals in the middle of the periodic table
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Name 4 physical properties of a transition metal
Good conductors, hard and strong, high densities and high melting points (apart from Mercury)
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How reactive are transition metals?
Less reactive than group 1
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Why are transition metals important in the industry?
They can be used as catalysts
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Do transition metals react vigorously with oxygen or water?
No
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What can a transition metal form?
Ions with different charges, in compounds that are coloured
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Other cards in this set

Card 2

Front

How did John Newlands organise elements?

Back

In order of mass but noticed the properties of every eighth element seemed similar

Card 3

Front

How did Mendeleev organise the elements?

Back

Preview of the front of card 3

Card 4

Front

Why did scientists think Mendeleev's discovery was a scientific breakthrough?

Back

Preview of the front of card 4

Card 5

Front

What group are the noble gases?

Back

Preview of the front of card 5
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