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8th Grade Science Test Study Sheet
Atoms, Elements, and the Periodic Table
1. Know the historical development of the modern atomic theory and
what Democritus, Dalton, Thomson, Rutherford, Bohr and Chadwick
each contributed to the modern atomic theory.
2. Know the basic parts of an atom and the electrical charges of each
3. Know how to determine the number of protons, electron, and neutrons
of an atom given its atomic number and mass number.
4. Know how Mendeleev arranged his first periodic table and what his
table enabled him to predict.
5. Know how the periodic table is arranged. What are periods and what
do they indicate about an element? What are groups and what do they
indicate about an element?
6. What information is given in each element’s periodic table “box?”
What does each of those items mean?
7. Know the main types of elements in the periodic table (metals, semimetals, non-metals, inert gases)? Where are they generally located on
the table? What are some of the properties of each?
8. What is the reactivity of the groups in the periodic table? Which ones
are most reactive? Which group rarely reacts with other elements?
How does reactivity change as you go down the family or across a
9. What are the names of the eight main groups? What are some
common elements in each group?
10. How many valence electrons does each group have? What is the
greatest number of valence electrons that an atom can have?
11. Know how to draw an electron dot diagram and a Bohr atom model.
The test has 40 multiple choice questions.
The test is worth 80 points.