Ionisation Energies Revision. 0.0 / 5 ? ChemistryIonisation EnergiesA2/A-levelOCR Created by: ElishaGCreated 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. 1 of 13 What is successive ionisation energy? The energy required to remove each electron in turn. 2 of 13 Where is the first electron removed from? The outer shell as it's the highest energy electron. 3 of 13 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. 4 of 13 What are three factors that affect the first ionisation energy? 1)Atomic radius. 2)Electron shielding. 3)Nuclear charge. 5 of 13 What effect does increasing atomic radius have on first ionisation energy? Ionisation energy decreases. 6 of 13 What effect does increasing electron shielding have on first ionisation energy? Ionisation energy decreases. 7 of 13 What effect does increasing nuclear charge have on ionisation energy? Ionisation energy increases. 8 of 13 What effect does increasing nuclear attraction have on first ionisation energy? Ionisation energy increases. 9 of 13 What is the trend in ionisation energy as you go down a group? First ionisation energy decreases. 10 of 13 What is the trend in ionisation energy as you go across a period? First ionisation energy increases. 11 of 13 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. 12 of 13 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. 13 of 13
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