structure

• Isotopes have the same chemical reactions because:

  They have the same electronic configuration
• The relative abundance of the two isotopes can be found by:

  • Measure the intensity of the number of particles of each isotope detected;
  • In a mass spectrometer
• The electronic configuration of a bromine atom (35) is:

  • 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5 - The number of electrons in the fourth quantum shell of bromine is: 
  • 7
• A nucleus with an odd number of protons will always contain an odd number of neutrons.