final part 2")

3 Written Questions

1. an atom or group of atoms that has lost or gained more electrons
2. the sum of the number of protons ans neutrons in the nucleus of an atom
3. when elements are arranged a certain way similarities in their prop. will occur

3 Multiple Choice Questions

1. the weighted average of the masses of all naturally occuring
   1. atomic #
   2. atomic mass unit
   3. periodic law
   4. average atomic mass
2. # of protons in the nucleus of an atom
   1. group
   2. isotope
   3. period
   4. atomic #
3. horizontal rows in the periodic table
   1. group
   2. ion
   3. period
   4. periodic law

3 True/False Questions

1. isotope → atom that has the same # of protons as other atoms of the same element

   True        False

2. group → atoms of elements in the same group or column

   True        False

3. atomic mass unit → # of protons in the nucleus of an atom

   True        False