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Atomic Structure - Atomic Number/Mass
Test Description: Review of Atomic Structure: Atomic Number and Atomic Masses - High School Chemistry
Instructions: Answer all questions to get your test result.
1) What can be known if only the atomic number of an atom is known?
A
the total number of neutrons in the atom, only
B
the total number of neutrons in the atom, only
C
the total number of protons and the total number of neutrons in the atom
D
the total number of protons and the total number of electrons in the atom
2) An atom that contains 8 protons, 8 electrons, and 9 neutrons has
A
an atomic number of 9
B
a mass number of 17
C
a mass number of 25
D
an atomic number of 16
3) What is the total charge of the nucleus of a nitrogen atom
A
+2
B
+7
C
+1
D
+5
4) What is the total number of neutrons in the nucleus of a neutral atom that has 19 electrons and a mass number of 39?
A
58
B
20
C
19
D
39
5) An atom is electrically neutral because the
A
number of protons is equal to the number of neutrons
B
ratio of the number of neutrons to the number of electrons is 1:1
C
ratio of the number of neutrons to the number of protons is 2:1
D
number of protons is equal to the number of electrons
6) The number of neutrons in the nucleus of an atom can be determined by
A
subtracting the atomic number from the mass number
B
adding the mass number to the atomic mass
C
adding the atomic number to the mass number
D
subtracting the mass number from the atomic number
7) What is the atomic number of an element that has 6 protons and 8 neutrons?
A
2
B
14
C
6
D
8
8) An atom of helium-4 differs from an atom of lithium-7 in that the atom of helium-4 has
A
two less protons
B
one more neutron
C
two less neutrons
D
one more proton
9) The atomic number of any atom is equal to the number of
A
protons in the atom, only
B
neutrons plus protons in the atom
C
protons plus electrons in the atom
D
neutrons in the atom, only
10) In which list are the elements arranged in order of increasing atomic mass?
A
Fe, Co, Ni
B
Cl, K, Ar
C
Te, I, Xe
D
Ne, F, Na
*select an answer for all questions
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