Ionisation Energies Revision.

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  • Created by: ElishaG
  • Created on: 20-02-17 12:17
What is first ionisation energy?
The energy needed to remove one electron from each atom in one mole of gaseous atoms to form one mole of gaseous +1 ions.
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What is successive ionisation energy?
The energy required to remove each electron in turn.
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Where is the first electron removed from?
The outer shell as it's the highest energy electron.
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Why is ionisation always an endothermic process?
Energy is required to overcome the attraction between the positive nucleus and negative electron that is being removed.
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What are three factors that affect the first ionisation energy?
1)Atomic radius. 2)Electron shielding. 3)Nuclear charge.
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What effect does increasing atomic radius have on first ionisation energy?
Ionisation energy decreases.
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What effect does increasing electron shielding have on first ionisation energy?
Ionisation energy decreases.
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What effect does increasing nuclear charge have on ionisation energy?
Ionisation energy increases.
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What effect does increasing nuclear attraction have on first ionisation energy?
Ionisation energy increases.
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What is the trend in ionisation energy as you go down a group?
First ionisation energy decreases.
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What is the trend in ionisation energy as you go across a period?
First ionisation energy increases.
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What is the trend in successive ionisation energy as each electron is removed?
It increases as proton:electron ratio increases,remaining electrons closer to nucleus.overall nuclear attraction increases.
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Why is there sometimes a large increase in ionisation energy?
Outermost electron is in a new shell closer to nucleus, less shielding, overall nuclear attraction increases.
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Other cards in this set

Card 2

Front

What is successive ionisation energy?

Back

The energy required to remove each electron in turn.

Card 3

Front

Where is the first electron removed from?

Back

Preview of the front of card 3

Card 4

Front

Why is ionisation always an endothermic process?

Back

Preview of the front of card 4

Card 5

Front

What are three factors that affect the first ionisation energy?

Back

Preview of the front of card 5
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