Chemistry 0.0 / 5 ? ChemistryThe Periodic TableASAQA Created by: jatyizationCreated on: 22-01-14 23:04 What is the definition of Ionisation Energy? Energy required to remove 1 mole of electrons from one mole of gaseous atoms 1 of 5 Name 3 reasons why ionisation energy increases across a period. Nuclear charge increases, atomic radius decreases and repulsion of electrons in a pair while shielding remains the same. 2 of 5 Why does ionisation energy decrease down a group? More inner filled energy levels so shielding increases and atomic radius decreases 3 of 5 Why does electronegativity increase across period 3? Proton number increases so their is a greater attraction of electrons in a covalent bond 4 of 5 How is atomic radii measured? Half the distance between between centres of 2 of the same atoms in a covalent bond 5 of 5
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