Chem - Bonding 0.0 / 5 ? ChemistryBonding & shapesASAQA Created by: KTPLCreated on: 20-11-16 15:12 What is 'Metallic Bonding'? The attraction between delocalised outer shell electrons and positive metal ions in a lattice. 1 of 29 What is the 3D arrangement of metals? Giant Metallic Lattice 2 of 29 What surrounds the positive metal ions? A sea of delocalised electrons 3 of 29 What does delocalised mean? Not tied to a particular atom 4 of 29 What does 'giant' mean? Endlessly repeating 5 of 29 What does the number of delocalised electrons depends on? How many electrons are lost from each metal atom 6 of 29 What is Ionic Bonding? The electrostatic attraction between oppositely charged ions in a lattice 7 of 29 What does ionic bonding occur between? Metals + Non-metals 8 of 29 Metal ATOMS LOSE electrons and become... positively charged IONS 9 of 29 Non-metal ATOMS GAIN electrons and become... negatively charged IONS 10 of 29 What to remember when drawing IONs Square brackets, +/- sign 11 of 29 What is the structure of ionic substances? Giant Ionic Lattice 12 of 29 What elements do not form ions? Boron, usually Carbon and Silicon 13 of 29 What elements form more than one stable ion? Transition (metal) elements eg. Iron(II)/Iron(III) 14 of 29 What is a covalent bond? A shared pair of electrons 15 of 29 Where does covalent bonding occur? Between non-metals 16 of 29 What can covalent bonds be shown with? A line. e.g. F-F 17 of 29 What is a pair of electrons that aren't bonded called? A lone pair 18 of 29 2 examples of double bonds O2, CO2 19 of 29 2 example of triple bonds N2, HCN 20 of 29 What is a non-octet molecule? The the central atom does not have 8 electrons on outer shell (not a noble gas arrangement) 21 of 29 Examples of non-octet atoms Boron (B), Sulfur (S) - BF3, SF6 22 of 29 What is a co-ordinate bond? A covalent bond in which both electrons of the shared pair come from the same atom 23 of 29 The atom that accepts the lone is is electron... deficient 24 of 29 What can co-ordinate bonds be shown with? An arrow pointing from the atom donating the lone pair 25 of 29 What is the shape of a molecule determined by? Total no. of electron pairs around central atom; number of bonding pairs; number of lone pairs 26 of 29 What can the shape of molecules be determined by? Electron Pair Repulsion Theory (EPR Theory) 27 of 29 What pairs repel more, lone pairs or bonding pairs? Lone pairs 28 of 29 By how much does each lone pair reduce the bond angle by? 2.5 degrees 29 of 29
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