Atomic Structure summary C1.1

HideShow resource information
  • Created by: maddie
  • Created on: 19-11-12 10:17
View mindmap
  • Atomic Structure C1.1Summary
    • Element Symbols
      • mass number,A = proton number, Z + number of neutrons, N
      • Isotopes - atoms of the same element with different number of neutrons
    • Mass and Charge
      • Protons and neutrons has a mass of +1. Electrons have a negliable mass
      • Isotopes have the same atomic nuimber
    • Mass Spectrometer
      • 1. Ionisation - High energy electrons from electron gun hit atoms, atoms lose one electron forming ions with +1 charge.
      • 2. Acceleration - ions are accelerated by an electric field
      • 3. Deflection: magentic field causes ions to change direction. lighter ions are deflected more than heavy ions.
      • Detection: Detector detects ions of a particular mass.
    • Relative atomic mass
      • Masses of atoms are measured using the relative mass scale, relative to carbon-12.
      • Isotopic mass is the relative mass of one atom of that isotope comapered to 1/12th the mass of one C-12 atom.
      • Ar is the average relative mass of its atoms considering the isotopes and their abundances compared to c-12
    • Ionisation Energies
      • First ionisation energy: Energy needed to remove one mole of electrons from one mole of gaseous atoms to form one mole of ions with a single positive charge.
      • It takes less energy to remove an electron form atoms further down a group.
        • Ouer electron shell is further away from the nucleus.
        • More shielding as more inner electron shells.
        • Positive increase in charge has less effect than the increase in shielding.
      • Each successive ionisation energy one.
      • Electrons closer to the nucleus need much more energy to be removed.
  • Protons and neutrons has a mass of +1. Electrons have a negliable mass


No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Bonding & shapes resources »