Atoms and Reactions 0.0 / 5 ? ChemistryAtoms and ReactionsASOCR Created by: FranNichollsCreated on: 14-05-14 16:57 Isotopes Atoms of the same element with different numbers of neutrons. 1 of 12 Atomic (proton) number the number of protons in the nucleus of an atom. 2 of 12 Mass (nucleon) number the number of sub atomic particles (protons and neutrons) in the nucleus 3 of 12 Ion A positively or negatively charged atom or (co-valently bonded) group of atoms (a molecular ion) 4 of 12 Relative isotopic mass the mass of an atom of an isotope compared with one-twelfth of the mass of an atom of Carbon (12) 5 of 12 Relative atomic mass Aᵣ the weighted mean mass of an atom of an element compared with one-twelfth of thr mass of an atom of carbon (12) 6 of 12 Relative molecular mass Mᵣ - the weighted mean mass of a molecule compared with one-twelfth of the mass of an atom of carbon (12) 7 of 12 Relative formula mass the weighted mean mass of a formula unit compared with one-twelfth of the mass of an atom of carbon (12) 8 of 12 Amount of substance The quantity whose unit is the mole. Chemists use ‘amount of substance’ as a means of counting atoms. 9 of 12 Avogadro constant Nᴬ the number of atoms per mole of carbon (12) isotope (6.02 x 10²³ mol-1 ) 10 of 12 Mole the amount of any substance containing as many particles as there are carbon atoms in exactly 12g of the carbon(12) isotope. 11 of 12 Molar Mass M the mass per mole of a substance. The units of molar mass are g mol-1 12 of 12
Comments
No comments have yet been made