Atomic Radius

Atomic Radius

1. Atomic Size: defined by how closely an atom lies to a neighboring atom

2. Metals- atomic radius is half the distance between adjacent nuclei in a crystal of the element

3. Nonmetals- typically form compounds; atomic radius is half the distance between nuclei of two identical atoms that are bonded together

4. Ionic Radius

   • Atoms gain or lose electrons to form ions
     • Electrons gain a negative charge, so a loss or gain results in a net charge
       • Ions have either postive or negative energy
   • Cations: when atoms lose electron they form positive ions and become smaller
   • Anions: when atoms gain electrons they form negative ions and become larger