elements

• elements:

  • atoms with the same number of protons in nucleus
  • atoms with same atomic number
  • 100 different elements
• isotopes:

  • same as elements but extra neutrons
  • same number of protons diff neutrons
  • same atomic number different atomic mass
• relative atomic mass:

  • average of masses of the atoms of the isotopes

  relative atomic mass = isotope abundance(amount) x isotope mass num / abundances of all isotopes