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Atomic Structure
Test Description: What an atom is.
Instructions: Answer all questions to get your test result.
1) The nucleus of an atom has all of the following characteristics except that it
A
is very dense.
B
contains protons and neutrons.
C
contains almost all of the atom’s volume.
D
is positively charged.
2) What makes an atom electrically neutral?
A
The neutrons balance out the protons and electrons.
B
The nuclear forces contained in the atom neutralize the atom.
C
The number of protons is equal to the number of electrons.
D
The number of protons is equal to the number of neutrons.
3) The smallest particle of an element that retains the properties of that element is a(n)
A
proton
B
atom
C
electron
D
quark
4) What does the number 91 represent in the name zirconium-91?
A
the sum of protons and electrons
B
the atomic number
C
the mass number
D
the number of protons
5) An element has an atomic number of 72. The number of protons and electrons in a neutral atom of this element is
A
36 protons and 36 electrons
B
none of the above
C
72 protons and 72 electrons
D
72 protons and 0 electrons
6) Which of the following sets is correct?
A
Mg-24, 12 protons, 12 neutrons
B
Pb-207, 207 protons, 207 electrons
C
U-238, 92 protons, 92 neutrons
D
Zn-65, 65 protons, 65 electrons
7) An atom has an atomic number of 32 and a mass number of 73. How many protons, neutrons, and electrons does this atom contain?
A
32 protons, 73 neutrons, 32 electrons
B
41 protons, 32 neutrons, 41 electrons
C
73 protons, 73 neutrons, 41 electrons
D
32 protons, 41 neutrons, 32 electrons
8) Identify the element that has 31 neutrons and a mass of 59.
A
praseodymium
B
thorium
C
nickel
D
gallium
9) Isotopes of the same element have different
A
atomic numbers.
B
chemical properties.
C
masses.
D
number of protons.
10) All atoms of the same element have the same
A
number of protons.
B
protons and neutrons.
C
mass number.
D
number of neutrons.
*select an answer for all questions
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