chemistry 0.0 / 5 ? ChemistryATOMIC STRUCTUREA2/A-levelAQA Created by: ceylinsurmeliiCreated on: 14-11-21 15:37 Avogadro's number 6.02 x 10^23 mol. The number of atoms per mole of Carbon-12. 1 of 26 Mole The amount of any substances containing as many elementary particles as there are carbon atoms in 12 grams of Carbon-12. 2 of 26 Relative atomic mass The ratio of average mean mass of one atom of an element to 1/12Relative molecular massth of the mass of an atom of Carbon-12. 3 of 26 Relative molecular mass The man average of the masses of the formula units relative to 1/12th of the mass of a Carbon-12. 4 of 26 Isotope Forms of the same element with the have different numbers of neutrons. 5 of 26 Water of crystallization Water molecules that are bonded into a crystalline structure of a compound. 6 of 26 Relative isotopic mass The mass of an atom of an isotope compared with one-twelfth of the mass of an atom of carbon-12. 7 of 26 Oxidation number A measure of the number of electrons that an atom uses to bond with atoms of another element. 8 of 26 Amount of substance Use amount of substance as a means of counting atoms. 9 of 26 Covalent bond The strong electrostatic attraction between a shared pair of electrons and the nuclei of the bonded atoms. 10 of 26 Dative covalent bond A shared pair of electrons which has been provided by one of the bonding atoms only. 11 of 26 Empirical formula Shows the simplest whole number ratio of atoms of each element in a compound. 12 of 26 Electron density The probability of an electron being present at a specific location. 13 of 26 Ionic bond Electrostatic attraction between positive and negative ions. 14 of 26 First ionization energy Is the energy required to remove 1 electron from each atom is one mole of gaseous atom of an element to form one mole of gaseous 1+ ions. 15 of 26 Molecular formula Shows the number and type of atoms present of each present in a compound. 16 of 26 Metallic bond Electrostatic attraction between positively charged metal and sea of delocalised electrons. 17 of 26 London dispersion forces Intermolecular forces are the forces between molecules. 18 of 26 Group 2 (down the group) nuclear charge + shielding + overall nuclear attraction - (reactivity is INCREASE due to ionization energy is LOW.) 19 of 26 Group 7 Reactivity decreases down the group(not because of ionization energy). 20 of 26 3 bonding pairs, 0 lone pair Trigonal planar (120) 21 of 26 2 bonding pairs, 2 lone pairs Non-linear (104.5) 22 of 26 4 bonding pairs, 0 lone pair Tetrahedral (109.5) 23 of 26 2 bonding pairs, 0 lone pair Linear (180) 24 of 26 6 bonding pairs, 0 lone pair Octohedral (90) 25 of 26 3 bonding pairs, 1 lone pair Pyramidal (107) 26 of 26
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