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Unit Two Review
Test Description: Review
Instructions: Answer all questions to get your test result.
1) The mass of an electron is
A
a tiny fraction of the mass of an atom.
B
smaller than the mass of a proton.
C
smaller than the mass of a neutron.
D
all of the above.
2) One atomic mass unit is ___.
A
1/12 the mass of a carbon-12 atom.
B
approximately the mass of one proton plus one neutron.
C
1/16 the mass of an oxygen-16 atom
D
exactly the mass of one proton
3) The atomic mass of an atom is usually not a whole number because it accounts for
A
the mass of the atom’s electrons.
B
only the mass of each of the atom’s isotopes.
C
only the relative abundance of the atom’s isotopes.
D
both the relative abundance and the mass of each of the atom’s isotopes.
4) How many valence electrons does a chlorine atom have if its electron configuration is 1s2 2s2 2p6 3s2 3p5?
A
5
B
21
C
3
D
7
5) What is the charge of an atom?
A
negative
B
neutral
C
positive
6) What is the charge of the nucleus of an atom?
A
neutral
B
positive
C
negative
7) The number of protons and electrons changes between isotopes of a given element.
A
True
B
False
8) Which statement is false?
A
The neutron is found in the nucleus of the atom.
B
Protons have a positive charge.
C
The nucleus is positively charged.
D
Electrons are negative and have a mass of 1 amu.
9) Which of the following is the configuration for iron?
A
1s2-2s2-2p6-3s2-3p2
B
1s2-2s2-2p6-3s2-3p6-4s2-3d6
C
1s2-2s2-2p6-3s2-3p6-4s2-3d10-4p6-5s2-4d1
10) You do not need to know how many isotopes there are when determining the atomic mass of an element.
A
False
B
True
*select an answer for all questions
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