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Test Description: For introductory chemistry students
Instructions: Answer all questions to get your test result.
1) The octet rule says
A
atoms become less stable with eight electrons in their outer energy level.
B
atoms will change their configurations and become a noble gas.
C
atoms become more stable with eight electrons in their outer energy level.
D
atoms will become more reactive and chemically bond with noble gases.
2) A compound composed of electrically charged atoms is called a(n)
A
octet compound.
B
ionic compound.
C
covalent compound.
D
chemically stable compound.
3) Nitrogen has five valence electrons. How many pairs of electrons must two nitrogen atoms share in order for each atom to have eight valence electrons?
A
one
B
zero
C
three
D
two
4) The formation of an ionic bond involves the
A
transfer of electrons
B
transfer of protons
C
sharing of electrons
D
transfer of neutrons
5) Which of the following compounds does NOT contain molecules?
A
H2O
B
H2
C
MgCl2
D
CO2
6) Which of the following groups contain three elements with stable electron configuration?
A
lithium, krypton, argon
B
argon, neon,barium
C
helium, xenon, argon
D
xenon, neon,boron
7) Which of the following is a typical property of an ionic compound?
A
low melting point
B
not ductile
C
poor conductor of electric current when melted
D
tendency to shatter when struck
8) A neutral group of atoms that are joined together by one or more covalent bonds.
A
molecule
B
polyatomic ion
C
ionic compound
D
cation
9) The elements most likely to form more than one type of ion are the
A
transition metal
B
alkaline earth metal
C
halogens
D
alkali metals
10) A type of bond in which two atoms share a pair of valence electrons
A
ionic
B
molecule
C
covalence
D
metallic
*select an answer for all questions
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