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Final Review 4
Test Description: Final Review part 4
Instructions: Answer all questions to get your test result.
1) Which statement about subatomic particles is true?
A
Neutrons have no charge and no mass.
B
Protons, neutrons, and electrons all have about the same mass
C
An electron has far less mass than either a proton or neutron.
D
Unlike protons or neutrons, electrons have no mass.
2) Which of the following is unique for any given element?
A
the mass of a neutron
B
the number of protons
C
the charge on the electrons
D
the number of neutrons
3) The number of protons in one atom of an element is that element’s
A
isotope.
B
balanced charge.
C
mass number.
D
atomic number.
4) To find the number of neutrons in an atom, you would subtract
A
atomic number from electron number.
B
isotope number from atomic number.
C
mass number from atomic number.
D
atomic number from mass number.
5) Suppose an atom has a mass number of 23. Which statement is true beyond any doubt?
A
The atom has an odd number of neutrons.
B
The atom is not an isotope.
C
The atomic number is less than 11.
D
The number of protons in the nucleus does not equal the number of neutrons.
6) Which statement is true about oxygen-17 and oxygen-18?
A
They are isotopes of oxygen.
B
Their atoms have an identical mass.
C
The have the same mass number.
D
They do not have the same number of protons.
7) What can you assume has happened if an electron moves to a higher energy level?
A
The atom has lost an electron.
B
The electron has lost energy.
C
The atom has become more stable.
D
The electron has gained energy.
8) What does the electron cloud model describe?
A
the mass of the electrons in an atom
B
the precise locations of electrons in atoms
C
the most likely locations of electrons in atoms
D
the number of electrons in an atom
9) A horizontal row on the periodic table is called
A
family
B
column
C
group
D
period
10) The mass number of an element is
A
twice the number of protons in one atom of the element.
B
a ratio based on the mass of a carbon-12 atom.
C
the sum of the protons and neutrons in one atom of the element.
D
a weighted average of the masses of an element’s isotopes.
*select an answer for all questions
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