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Chemistry 2 Review
1. Label the following information on the periodic table below(make a key):
a. Metals, nonmetals, and metalloids
b. Periods and groups
c. Horizontal and Vertical
d. Most reactive and valence electrons
2. Complete the following questions for the Bohr model to
the right:
a. What is atomic number of the atom? 3
+ +
b. What is the mass number of the atom? 7
c. What is the name of the element represented?
Lithium
d. What is the chemical symbol of the element?
Li
-
+
- -
6. What properties to metals, nonmetals, and metalloids have? Metals - Shiny luster, malleable, some
are magnetic, good conductors of electricity and heat. Nonmetals – dull luster, brittle,
nonmagnetic, insulators. Metalloids- properties of both, sometimes called semi-conductors.
7. What are the two most reactive families on the periodic table? Groups 1 and 17
8. What are valence electrons? How do you find them? Electrons on the outermost electron shell or
orbital. Group 1 has 1, group 2 has 2, groups 13-18 subtract 10 from the group #.
9. How do you know the reactivity of an element? In general, if the atom doesn’t have a full outer
shell, it will react. The atoms with the least valence electrons tend to react more, and those
with more valence electrons react less.
10. Label the following on the box below- symbol, name, atomic number, atomic mass.
The Periodic Table
11. The ________periods_________ on the periodic table tell you how many electron shells an atom of
an element has.
12. The __________group #’s_________ on the periodic table tell you how many valence electrons and
atom of an element has.
13. Elements in the same _group___ react similarly.
14. There are __7__ periods and ___18__ groups on the periodic table.
15. _____Groups___ are the vertical columns on the periodic table.
16. ______Periods___ are the horizontal rows on the periodic table.
Who am I?
17. _____Magnesium_______ I have 12 protons.
18. _______Gallium_______ I have 3 shells and 3 valence electrons.
19. _________Neon________ I have 2 shells and do not react with other elements.
20. _________Beryllium________ I am a metal with 4 protons.
21. Oxygen has 6 valence electrons. Which group on the periodic table would oxygen easily react
with? Group 2
22. Fluorine has 7 valence electrons. How many more does it need to be full? Which of these would
it react with the easiest – sodium, calcium or phosphorus? Why? It needs 1. Sodium because it has the
1 valence electron Fluorine needs and Fluorine has the 7 valence electron sodium needs.