Ionisation Energy

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Ionisation Energy

Chemistry

Atoms

A-Level Chemistry

AQA

Physical Chemistry

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5 Terms

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First Ionisation Energy

  • amount of energy required to remove one mole of electrons from one mole of atoms in the gaseous state

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First Ionisation energy Equation

X(g) → X+ (g) + e- 

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Factors affecting ionisation energy

  • No. protons

  • Distance from nucleus

  • Shielding

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How No. Protons Affect Ionisation Energy

  • The more protons in the nucleus, the stronger the positive charge

  • Stronger attraction to the nucleus

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How distance from nucleus affects Ionisation Energy

  • greater the distance from nucleus, weaker the attraction to nucleus

  • Lower ionisation energy