Chemistry 3- periodic table + electrons 0.0 / 5 ? ChemistryThe Periodic TableASOCR Created by: LaellexCreated on: 25-04-16 18:18 What is the periodic table? An arrangement of elements in order of increasing atom in number (protons) 1 of 15 Where are the groups? Horizontal 2 of 15 What do groups contain? Elements with similar chemical properties 3 of 15 What do periods contain? Elements that show a pattern of repeating trends, across periods 4 of 15 The repeating pattern of trends is known as what? Periodicity 5 of 15 Why do elements ina group have similar chemical properties? They have the same no. of electrons on their outershell 6 of 15 What is the first ionisation energy? The energy required to remove 1 electron from each atom in one mole of the gaseous element, to form one mole of gaseous 1+ ions 7 of 15 To remove an electron from an atom, why must energy be supplied to the electron? To overcome the nuclear attraction (between the positive nucleus and negative electron) 8 of 15 What factors affect ionisation? Nuclear charge, atomic radius + electron shielding 9 of 15 What is nuclear charge? The total charge of protons in the nucleus 10 of 15 The greater the nuclear charge... The larger the nuclear attraction- so more energy required to form 1+ ion 11 of 15 What is atomic radius? The overall size of an atom (distance between the nucleus and outer electrons) 12 of 15 The larger the atomic radius... The smaller the nuclear attraction- (as electrons are further away from nucleus), so less energy required to form 1+ ion 13 of 15 What is electron shielding? Inner-shell electrons repelling the outer electrons. The repelling= shielding effect 14 of 15 The more inner shells... The greater the shielding effect, the smaller the nuclear attraction so less energy required to remove an electron 15 of 15
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