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Unit 1B Atoms
Test Description: This is part one of a 3-part review of Unit 1B.
Instructions: Answer all questions to get your test result.
1) Mass number is the number of
A
protons plus neutrons
B
protons only
C
protons plus electrons
D
neutrons plus electrons
2) The charge on an ion can be calculated as
A
protons minus neutrons
B
protons minus electrons
C
neutrons minus electrons
D
electrons minus neutrons
3) The atomic number identifies the element. The atomic number is the number of ____ in the nucleus of its atoms.
A
electrons
B
neutrons
C
charges
D
protons
4) Isotopes of an element have the same number of __ but a different number of __.
A
neutrons; protons
B
protons; neutrons
C
electrons; protons
D
neutrons; electrons
5) It has 20 protons and 18 electrons. The element is ___ and it has a charge of ___. (hint: use your periodic table)
A
magnesium; +2
B
oxygen; -2
C
calcium; +2
D
sodium; -2
6) A sodium atom has a mass number of 24. How many neutrons does it have? (Hint: figure out the number of protons using the periodic table)
A
12
B
13
C
14
D
11
7) An atom has 27 protons and 35 neutrons. Its mass number is
A
62
B
cannot be determined
C
27
D
35
8) For an atom to be neutral it must have
A
an equal number of protons and electrons
B
more protons than electrons
C
fewer protons than electrons
D
an equal number of protons and neutrons
9) Compared to the Carbon-12 isotope, the Carbon-14 isotope has
A
the same number of protons but more neutrons
B
more protons and fewer neutrons
C
the same number of neutrons but more protons
D
more neutrons and fewer protons
10) The charge and location of neutrons in an atom are, respectively,
A
0 and outside the nucleus
B
0 and in the nucleus
C
-1 and outside the nucleus
D
-1 and in the nucleus
*select an answer for all questions
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