The Periodic table 2.0 / 5 based on 1 rating ? ChemistryThe Periodic TableA2/A-levelOCR Created by: Kat098Created on: 03-04-18 22:01 A period Horizontal row of elements in the periodic table 1 of 17 A group Vertical column in periodic table. Have similar chemical properties and same number of outer-shell electrons 2 of 17 Periodicity Trend in properties that is repeated across each period 3 of 17 Ionisation The gaining or losing of electrons of an atom to become an ion 4 of 17 First ionisation energy Energy required to remove one electron from each atom in one mole of the gaseous element to form one mole of gaseous 1+ ions 5 of 17 Atomic radius the size of its atoms, distance from nucleus to the boundary of the surrounding cloud of electrons 6 of 17 Electron shielding Repulsion between electrons in different inner shells. Reduces attracitve force from positive nucleus to outer-shell electrons 7 of 17 Successive ionisation energies A measure of the energy required to remove each electron in turn 8 of 17 Thermal Decomposition The breaking up of a chemical substance with heat into at least two chemical substances 9 of 17 Displacement reaction More reactive element takes the place of a less-reactive element in a compund (more reactive bonds, other is alone) 10 of 17 Disproportionation oxidation and reduction of the same element in a redox reaction 11 of 17 Precipitation reaction The formation of a solid from a solution. Precipitates are often formed when two aqueous solutions are mixed together 12 of 17 First ionisation energy... Increases across period. Decreases down group 13 of 17 Testing for carboante ions (CO3^2-) Add dilute strong acid. Collect gas and pass through lime water. Fizzing and cloudy limewater from carbon dioxide 14 of 17 Testing for sulfate ions (SO4^2-) Add dilute hydrocholoric acid. Add barium chloride. White precipitate of barium sulfate forms 15 of 17 Testing for halide ions Dissolve in water. Add aqueous silver nitrate. White (Cl), cream (Br), yellow (I). Add aqueous ammonia. Cl dissolve in dilute, Br in conc, I in none 16 of 17 Testing for ammonium ions Add sodium hydroxide solution. Warm gently. Turn red litmus paper blue and distinctive smell 17 of 17
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