AS Chemistry - Electronegativity 0.0 / 5 ? ChemistryElectronegativityASOCR Created by: ambermeganjonesCreated on: 24-04-16 16:14 Define electronegativity The ability of an atom to attract the bonding pair of electrons towards itself in a covalent bond. 1 of 7 What causes electronegativity? An uneven distribution of electrons in a covalent bond 2 of 7 What happens to electronegativity across a period and why? It increases - same number of shells, atomic radius decreases and greater nuclear attraction 3 of 7 What happens to electronegativity down a group? It decreases - more shells, atomic radius increases, more shielding, weaker nuclear attraction 4 of 7 What is the polarity of non symmetrical molecules with polar bonds? Polar because bonds cannot cancel 5 of 7 What is the polarity of symmetrical molecules with polar bonds? Non polar because symmetrical molecules cancel 6 of 7 Why is CH4 non polar? C and H have very similar electronegativity. 7 of 7
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