Explain the factors effecting linizatiuon energy
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Atomic Structure: 3 Factors Affecting Ionisation Energy
April 26, 2018 By Sean Chua Leave a Comment
3 Factors Affecting Ionisation Energy - JC A Level H2 Chemistry Tuition Teacher
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Today we are going to take a look at the 3 Factors Affecting Ionisation Energy in atomic structure. We have looked at the formal definition of ionisation energy previously and it’s really important that you are comfortable with that first.
3 Factors Affecting Ionisation Energy
1. Size of the positive nuclear charge
As the nuclear charge increases, its attraction for the outermost electron increases and more energy is required to remove an electron.
This means that the ionisation energy increases.
2. Size of atom (distance of outermost electron from the nucleus)
As atomic size increases, the attraction of the positive nucleus for the negative electron decreases and less energy is required to remove an electron.
This means that the ionisation energy decreases.
3. Screening effect of inner shell electrons
The outermost electron is screened (shielded) from the attraction of the nucleus by the repelling effect of the inner electrons.
As shielding increases, the attraction of the positive nucleus for the negative electron decreases and less energy is required to remove an electron.
This means that the ionisation energy decreases.
Explanation:
Generally the ionisation energy is influenced by the amount of charge on the atomic nucleus and the orbitals that the highest energy electrons occupy. ... Another factor is the number of electrons at that energylevel.