Ionisation Energies

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  • Created by: zoolouise
  • Created on: 04-04-16 10:01
What is ionisation?
The process of removing electrons from an atom.
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What is the energy needed to remove each successive atom called?
The first, second, third, etc., ionisation energy.
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What is the equation for the first ionisation energy?
X(g) > X+(g) + e-
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What is the definition of the molar first ionisation energy?
The molar first ionisation energy of an element is the energy required to remove one mole of electrons from one mole of its gaseous atoms.
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What is the definition of electron shielding?
Electron shielding is the repulsion between electrons in different shells, the inner shell electrons repel outer shell electrons.
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How are electrons held in their shells?
Electrons are held in their shells by the attraction to the positive nucleus. The greater the attraction, the greater the ionisation energy.
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What are the three things that attraction to the nucleus depends on?
The size of the nuclear charge, The distance of outer electron from the nucleus and Shielding by electrons in filled inner shells.
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What is the size of the nuclear charge?
Greater the nuclear charge, greater the attractive force on the outer electron and therefore greater the ionisation energy
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What is the distance of outer electron from nucleus?
The force of attraction between the nucleus and outer electron decreases as the distance between them increases. Further an electron from the nucleus, lower the ionisation energy.
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What is the shielding by electrons in filled inner shells?
Electrons in the inner shells repel electrons in the outer shell, reducing the effect of positive nuclear charge. More filed inner shells/subshells, smaller the attractive force on outer electrons and thus, lower the ionisation energy
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What do the ionisation energies a element has depend on?
An element has as many ionisation energies as it has electrons.
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Card 2

Front

What is the energy needed to remove each successive atom called?

Back

The first, second, third, etc., ionisation energy.

Card 3

Front

What is the equation for the first ionisation energy?

Back

Preview of the front of card 3

Card 4

Front

What is the definition of the molar first ionisation energy?

Back

Preview of the front of card 4

Card 5

Front

What is the definition of electron shielding?

Back

Preview of the front of card 5
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