1. Some atoms for Ions IONS IONS
Ions are charged particles that come from atoms.
Ions can have either a positive (+) or negative (-) charge.
Written with the element symbol with a superscript . H+1

2. Some atom Form Ions Positive ions Negative Ions
Metals form positive ions
Positive ions are formed by losing electrons.
Group #s tell what the (+) charge will be.
Lithium (Li) atom loses one electron to become Li+1
Non-metals form negative ions.
Negative ions are formed by gaining electrons.
How far you are from group 8 is what your charge.
Fluorine (F) atom gains one electron to become F-1

3. How do structures of atoms Differ?
Protons = the atomic # of an element
Protons give the element it’s identity
Protons are given the identity Z number
Identify each element
Z=2, Z=45, Z=23
Isotopes are atoms of an element with the same # of protons, but different # of neutrons.
The Mass number is the number of protons + the number of neutrons.
Mass # is given the identity A number