atomic structure

• ions that needs to be known

  SO4^2-, CO3-,OH-,NO3-,NH4+
• what are molecular ions

  covalently bonded atoms that lose or gain electrons
• what is empirical formula

  the simplest whole number ratio of atoms of each element represented in a compound
• sulfate ion

  SO4^2-
• carbonate ion

  CO3^2-
• nitrate ion

  NO3-
• hydroxide ion

  OH-
• ammonium ion

  NH4+
• do metals lose or gain electrons

  lose electrons and becomes positive
• group number = number of electrons in the outer shell
• relative atomic mass - the weighed mean mass of an atom of an element compared with one twelfth of the mass of an atom of carbon-12
• relative isotopic mass - the mass of an atom of an isotope compared with one twelfth of the mass of an atom of carbon-12