Fichas
Key Terms
Fichas del conjunto (31)
- 1the Atomic number (Z)the number of protons in the nucleus of an atom of that element
- 2Mass Numberthe sum of the number of protons and the number of neutrons in the nucleus of that atom
- 3Isotopesatoms of the same element with different masses
- 4Relative Atomic Mass (Ar)the weighted average (mean) mass of an atom compared to 1/12 of the mass of a carbon12 atom
- 5Relative Isotopic Massthe mass of an individual isotope relative to the the mass of 1/12 of the mass of a carbon12 atom
- 6Molecular Ion Peakpeak with the highest m/z ratio on the mass spectrum, the M peak
- 7Quantum Shelldefines the energy level of the electron
- 8Orbitalregion within the atom that can hold up to 2 electrons with opposite spins
- 9Electron Configurationshows the number of electrons in each sublevel in each energy level of an atom
- 10Hund's Rulestates that electrons will occupy the orbitals singly before pairing takes place
- 11Pauli Exclusion Rulestates that 2 electrons can not occupy a single orbital unless they have opposite spins
- 12First Ionisation Energythe energy it takes to remove an electron from each atom in a mole of atoms in the gaseous state
- 13Second Ionisation Energythe energy required to remove an electron from each singly charged positive ion in one mole of positive ions in the gaseous state
- 14Groups, Periods and Blocksvertical columns = groups
horizontal rows = periods
the periodic table is divided into blocks - 15Periodicityregularly repeating pattern of the atomic, chemical and physical properties of an atom with increasing atomic number
- 16Delocalised Electronselectrons not associated with any single atom or any single covalent bond
- 17Metallic Bondingthe electrostatic force of attraction between the nuclei of metal cations and delocalised electrons
- 18Electronegativitythe ability of an atom to attract the bonding pair of electrons in a covalent bond
- 19Polar Covalent Bonda type of covalent bond where the electrons are unequally distributed. because of this, one atom carries a slight positive charge and the other a slight negative charge
- 20Discrete (simple) Moleculean electrically neutral group of two or more atom bonded together by chemical bonds
- 21Displayed (full structural) Formulashows the bonding pair as a line drawn between the two atoms involved
- 22Dipolewhen two charges of equal magnitude but opposite signs are separated by a small distance
- 23The Hydrogen Bondan intermolecular interaction (from which there is some evidence of bond formation) between a hydrogen atom of a molecule (or molecular fragment) bonded to an atom more electronegative than hydrogen and another atom in the same or different molecule
- 24Redox Reactionreaction that involves both reduction and oxidation
- 25Oxidationthe loss of electrons, ON increases
- 26Reductiongain of electrons, ON decreases
- 27oxidising agenta species (atom, molecule or ion) that oxidises another species by removing one or more electrons. when an oxidising agent reacts it gains electrons and is, therefore, reduced
- 28Reducing Agenta species that reduces another species by adding one or more electrons. when a reducing agent reacts, it loses electrons and is, therefore, oxidised
- 29Oxidation Numberthe charge that an ion has or the charge that it would have if the species were fully ionic
- 30Disproportionationthe simultaneous oxidation and reduction of an element in a single reaction
- 31—
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- AS - Level chemistry Fichas sobre Key Terms, creado por olivia.hill.me el 31/10/2015.
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