Isotopes

Isotopes

1. Isotopes are atoms from an element that have the same proton and electron numbers but a different neutron number

   • Carbon has 3 isotopes - Carbon 12, Carbon 13, Carbon 14
   • The change in the neutron number does not change the element or its chemical properties
   • Protons - determine the type of element
   • Electrons - determine the chemical properties

2. Relative atomic mass

   • The average mass of all isotopes of an element
     • ((relative isotopic mass 1 x %) + (relative isotopic mass 2 x %)) / 100
   • Group number - electrons in outer shell
   • Period number - number of shells