Final Review 4 Question Preview (ID: 12155)
Final Review Part 4.
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Which statement about subatomic particles is true?
a) An electron has far less mass than either a proton or neutron.
b) Unlike protons or neutrons, electrons have no mass.
c) Neutrons have no charge and no mass.
d) Protons, neutrons, and electrons all have about the same mass
Which of the following is unique for any given element?
a) the charge on the electrons
b) the mass of a neutron
c) the number of neutrons
d) the number of protons
The number of protons in one atom of an element is that element’s
a) balanced charge.
b) isotope.
c) atomic number.
d) mass number.
To find the number of neutrons in an atom, you would subtract
a) atomic number from electron number.
b) mass number from atomic number.
c) isotope number from atomic number.
d) atomic number from mass number.
Suppose an atom has a mass number of 23. Which statement is true beyond any doubt?
a) The atom is not an isotope.
b) The atomic number is less than 11.
c) The number of protons in the nucleus does not equal the number of neutrons.
d) The atom has an odd number of neutrons.
Which statement is true about oxygen-17 and oxygen-18?
a) The have the same mass number.
b) Their atoms have an identical mass.
c) They do not have the same number of protons.
d) They are isotopes of oxygen.
What can you assume has happened if an electron moves to a higher energy level?
a) The atom has become more stable.
b) The atom has lost an electron.
c) The electron has lost energy.
d) The electron has gained energy.
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
A horizontal row on the periodic table is called
a) group
b) column
c) period
d) family
The mass number of an element is
a) a ratio based on the mass of a carbon-12 atom.
b) the sum of the protons and neutrons in one atom of the element.
c) a weighted average of the masses of an element’s isotopes.
d) twice the number of protons in one atom of the element.
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