5 Written Questions

1. the smallest particle of an element that retains its identity in a chemical formula
2. proposed that an electron is found only in orbits, around nucleus
3. positively charged. inside the nucleus, same number as atomic number
4. cathode ray, discovered that electrons have a negative charge.
5. (AMU) unit used when finding relative abundance

5 Multiple Choice Questions

1. Atomic Theory - Atoms of the same element are identical. atoms can be combined into whole number ratios
   1. atom
   2. Dalton
   3. protons
   4. period
2. negatively charged, floating around nucleus. number is the same as protons
   1. neutrons
   2. protons
   3. electrons
   4. Dalton
3. no charge, inside nucleus. atomic mass - proton = # of neutrons
   1. neutrons
   2. Dalton
   3. protons
   4. electrons
4. each vertical column of the periodic table
   1. Bohr
   2. group
   3. period
   4. atom
5. tiny central core of an atom composed of protons and neutrons. positively charged
   1. protons
   2. neutrons
   3. nucleus
   4. Dalton

4 True/False Questions

1. Isotopes → atoms that have the same number of protons but different number of neutrons

   True        False

2. period → the horizontal rows on a periodic table

   True        False

3. Rutherford → gold foil experiment - atoms are made up if mostly empty space with a small dense nucleus in the center

   True        False

4. Democritus → believed that atoms were indivisible and and indestructible

   True        False