C1 Periodic Table

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How are the elements in the periodic table arranged?
In order of atomic (proton) number.
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Elements found in the same group share what?
Similar properties.
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Elements of the same group have the same number of?
Electrons in the outermost shell.
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What does group number show?
Number of electrons in outermost shell.
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What does period number show?
Number of shells.
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Originally, how was the periodic table organised?
By atomic weight.
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What did Mendeleev do for this periodic table?
1. Left gaps for undiscovered elements.
2. Changed the order of elements.
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What were scientists able to predict for the missing elements?
Properties of elements.
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What type of ions do metals form?
Positive
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What type of ions do non-metals form?
Negative
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Where on the periodic table are metals and non-metals found?
Metals found on the left and non-metals on the right with a staircase of metalliods between them.
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Why are the noble gases unreactive?
They have a stable arrangement of electrons (full outermost shell)
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What is the trend in boiling point going down group 0?
Increases with increasing relative atomic mass.
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Why are the alkali metals in group 1?
1 electron on the outermost shell.
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Describe the reaction between alkali metal and water.
1. Hydrogen gas is given off, seen by bubbles/fizzing.
2. Alkali metal will float as it has a low density.
3. Alkali metal will move across the water.
4. More reactive metals eg potassium may set on fire/ignite.
5. A hydroxide (alkali) solution is formed
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Describe the trend in reactivity down group 1.
Reactivity increases, Li is the least reactive.
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Why are the halogens in group 7?
7 electrons in the outermost shell.
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How do the halogens travel?
As diatomic molecules (in pairs)
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Describe the trend in reactivity in group 7.
Reactivity decreases, F is the most reactive.
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As we go down group 7, what happens to the molecular mass, melting point and boiling point?
All 3 properties increase as we travel down group 7.
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What is a displacement reaction?
A more reactive halogen will displace a less reactive element from a compound.
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Which elements can Fluorine displace?
Chlorine, Bromine, Iodine.
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Which elements can Chlorine displace?
Bromine and Iodine
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Which elements can Bromine displace?
Iodine.
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Explain why Iodine cannot displace any other halogens.
It is the least reactive halogen and therefore will not displace another from its compound.
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What can transition elements form?
Ions with different charges and coloured compounds.
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What are transition elements useful for?
Catalysts.
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Other cards in this set

Card 2

Front

Elements found in the same group share what?

Back

Similar properties.

Card 3

Front

Elements of the same group have the same number of?

Back

Preview of the front of card 3

Card 4

Front

What does group number show?

Back

Preview of the front of card 4

Card 5

Front

What does period number show?

Back

Preview of the front of card 5
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