formation of ions

• what is an ion?

  ions are charged particles that has gained or lost electrons, resulting in a positive or negative charge, they can be single atom or a group of atoms
• when metals form ions what happen?

  lose electrons from their outer shell to form positive ions
• when non metals form ions what happens?

  gain electrons into their outer shell to form negative ions
• which four groups are most likely to gain or lose electrons and how many?

  group 1-loses 1 electron = 1+ ion

  group 2-loses 2 electrons = 2+ ion

  group 6-gains 2 electrons = 2- ion

  group 7-gains 1 electron = 1- ion
• in an ionic equation what side does the electron have to be on if it’s being lost?

  right side= Na ➡️ Na+ + e-
• in an ionic equation what side does the electron have to be if it’s been gained?

  left side= Cl + e- ➡️ Cl-
• if magnesium was losing two electrons what would this equation look like?

  Mg ➡️ Mg2+ + 2e-