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Trimester 1: Atomic Structure
Test Description: Atoms, Ions, Isotopes
Instructions: Answer all questions to get your test result.
1) What is the mass number of an atom that has 4 protons, 6 neutrons, and 4 electrons?
A
10
B
4
C
14
D
6
2) What is the atomic number of an atom that has 6 protons, 6 neutrons, and 6 electrons?
A
cannot be determined
B
6
C
18
D
12
3) What is the charge of an atom that has 7 protons, 7 neutrons, and 10 electrons?
A
none of the above
B
positive (+)
C
negative (-)
D
neutral (0)
4) Which of the following pairs are isotopes of the same element?
A
atom Q (56 protons, 81 neutrons) and atom R (57 protons, 81 neutrons)
B
atom X (8 protons, 8 neutrons) and atom W (7 protons, 8 neutrons)
C
atom J (27 protons, 32 neutrons) and atom L (27 protons, 33 neutrons)
D
atom S (17 protons, 18 neutrons) and atom T (18 protons, 17 neutrons)
5) Ions have
A
unequal numbers of protons and neutrons
B
unequal numbers of protons and electrons
C
equation number of protons and neutrons
D
equal numbers of protons and electrons
6) isotopes have
A
same protons, same electrons
B
same protons, same electrons
C
same protons, different neutrons
D
same protons, different electrons
7) Which of the following describes protons?
A
located in nucleus
B
comprises atomic number
C
all of the above
D
positively charged
8) How many valence electrons does an atom of nitrogen (N) have?
A
14
B
5
C
2
D
7
9) An ion that consists of 7 protons, 6 neutrons, and 10 electrons is a(n)
A
cation with a net charge of 3+
B
anion with a net charge of 3-
C
anion with a net charge of 4+
D
cation with a net charge of 4-
10) How many pairs of electrons are shared in a molecule of H2?
A
1
B
cannot be determined
C
2
D
0
*select an answer for all questions
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