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Science 9
Chapter 7-8 Test
Name: _______________________ Section: ______
Part one: (Value of 10 points)
1. ___________________ is the stable arrangement of eight electrons in
the outer shell of an atom or ion.
2. ___________________ is an atom with a positive or negative charge
due to the loss or gain of electrons.
3. ___________________ is the attraction between positive and negative
ions.
4. ___________________ is any of the group 2 elements beryllium,
magnesium, calcium, strontium, barium, and radium; all are reactive soft, low
density metals.
5. ___________________ are the electrons in the outer shell of an atom,
which determine its power to combine with other elements.
6. ___________________ is the regular, repeating pattern in which ions in
ionic compounds fit together.
7. ___________________ is an attraction between atoms caused by the
sharing of electrons.
8. ___________________ is a compound made up of oppositely charged
ions.
9. __________________ is soft, blackish-grey form of carbon; used for
pencil lead and as a lubricant.
10. __________________ is a giant molecule created by the union of many
similar or identical molecules. (Example: proteins, plastics, nylon)
Part 2 (Value 10 points)
For the following 4 atomic models, name and label each.
Part three (Value 10 points)
Directions: Using the copy of the periodic table, answer the following
questions, and draw the Bohr model for each.
1. Mg
A) What is the elements name?
B) What is the atomic number?
C) What is the atomic mass number?
D) How many Protons?
E) How many Neutrons?
F) How many Electrons?
_____
_____
_____
_____
_____
_____
Diagram:
2. P
A) What is the elements name?
B) What is the atomic number?
C) What is the atomic mass number?
D) How many Protons?
E) How many Neutrons?
F) How many Electrons?
Diagram:
_____
_____
_____
_____
_____
_____
Part four (Value 14 points)
Directions: Draw a model to show two isotopes for the following elements.
Tell how many protons, neutrons and electrons each isotope has.
1. Cobalt
Co
2. Chromium Cr
Light
Heavy
P=
E=
N=
P=
E=
N=
Diagram:
Diagram:
Light
Heavy
P=
E=
N=
P=
E=
N=
Diagram:
Diagram:
Part five (Value 5 points)
Multiple Choice – for each of the following questions in this selection, circle
the letter of the phrase that best completes the phrase or answers the
questions.
1. Which of the following atoms does not have a stable octet?
A) An atom of sodium. (Na)
B) A chloride ion. (Cl-)
C) An argon atom. (Ar)
D) A sodium ion. (Na+)
2. Ionic compounds…
A) are composed of metal ions bonded to other metal ions.
B) are formed when metal react with non-metals.
C) are substances with low melting points.
D) are usually insoluble in water.
3. Molecular compounds…
A) are combinations of metals and non-metals.
B) form when electrons are shared.
C) are good conductors of electricity.
D) result from the transfer of electrons.
4. Diamond is…
A) a giant molecule made up of carbon atoms.
B) a gigantic rock on Mrs. Doyle finger.
C) a softer substance than graphite.
D) a two dimensional structure.
5. A herbicide is…
A) another name for a fertilizer
B) used to control insects
C) ammonium used to kill plants.
D) a chemical used to kill plants.
Part six
Short Answer (Value 16 points)
1. For each of the following atoms, draw a diagram that shows the number of
electrons in each of the shells. (Bohr diagram)
Sodium (Na)
Sulfur (S)
2. What is the difference between Ionic Compounds and Molecular
compounds? Write the key points for each in the columns below.
Ionic Compounds
Molecular Compounds
3. Name the three subatomic particles of the atom.
A) _______________________________
B) _______________________________
C) _______________________________
4. The first electron shell can hold up to how many electrons? ________
5. The second electron shell can hold up to how many electrons? _______
6. The third electron shell can hold up to how many electrons? _________
Part seven
True and False (Value 5 points)
Read each of the five statements below. Circle (T) if the statement is true,
and (F) if the statement is false.
1. Alkali metals lose an electron to form a stable octet.
T
F
2. A sodium ion (Na+) has a stable octet of electrons.
T
F
3. A bond is an attractive force between atoms.
T
F
4. Molecular compounds are produced when metal and nonmetal atoms bond.
T
F
5. Pencil lead is a close relative to diamond.
T
F