Chemistry: Ionisation Energy 0.0 / 5 ? ChemistryIonisation EnergyASAQA Created by: Shanice_DCreated on: 11-09-14 19:30 What do atoms become when electrons are removed? Positive ions 1 of 12 What is ionisation energy? Energy required to remove a mole of electrons from a mole of atoms in the gaseous state. It's a formation of positive ions. 2 of 12 What is ionisation energy measured in? kJmol-1 3 of 12 What is a mole? A quantity of a substance of particles, atoms, molecules or ions (6.022 x 10^23) 4 of 12 Why does the first electron need the least energy to remove it in ionisation energy? It is being removed from a neutral atom 5 of 12 Why does the second electron need more energy to remove it than the first in ionisation energy? It is being removed from a 1+ ion 6 of 12 Why are outer shell electrons harder to remove in ionisation energy? They are very close to the nucleus and the nucleus is a positive charge 7 of 12 Why does the ionisation energy increase when you go across the periodic table? There are more protons in the elements (nuclear charge is increasing) meaning it's more difficult to remove the electron(s) 8 of 12 What is electron affinity? The energy change for the formation of a negative ion 9 of 12 How many electrons do the s orbitals hold? 2 electrons each 10 of 12 How many electrons do the p orbitals hold? 2 electrons but come in groups of 3 meaning a total of 6 electrons 11 of 12 How many electrons do the d orbitals hold? 2 electrons but come in groups of 5 meaning a total of 10 12 of 12
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