Chemistry Ch.4 Test Review Question Preview (ID: 21521)
Review For Ch.4.
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The range in size of most atomic radii is approximately _________.
a) 2 to 5 cm
b) 2 to 5 nm
c) 5 x 10^-11 m to 2 x 10^-10 m
d) 5 x 10^-21 m to 2 x 10^-20 m
Which of the following is NOT a part of Dalton's atomic theory?
a) All elements are composed of atoms.
b) Atoms are always in motion.
c) Atoms of the same element are identical.
d) Atoms that combine do so in simple whole number ratios.
What is the atomic number for an element with 38 neutrons and a mass number of 78?
a) 40
b) 38
c) 78
d) none of the above
How many neutrons does an atom of Cu-64 have?
a) 64
b) 29
c) 35
d) none of the above
What is the mass number for a sulfur atom that has 18 neutrons in its nucleus?
a) 18
b) 16
c) 34
d) none of the above
How many electrons does an atom of tellurium have?
a) 52
b) 128
c) 76
d) none of the above
How many protons are present in an atom of F-19?
a) 19
b) 9
c) 10
d) none of the above
Which of the following is necessary to calculate the atomic mass of an element?
a) the atomic mass of carbon-12
b) the atomic number of the element
c) the relative masses of the element's protons and neutrons
d) the masses of each isotope of the element
The atomic mass of an element is the _________.
a) total number of subatomic particles in its nucleus
b) weighted average of the masses of the isotopes of the element
c) total mass of the isotopes of the element
d) average of the mass number and the atomic number for the element
What unit is used to measure weighted average atomic mass?
a) gram
b) angstrom
c) nanogram
d) amu
How is the number of neutrons in the nucleus of an atom calculated?
a) Add the number of electrons and protons together.
b) Subtract the number of electrons from the number of protons.
c) Subtract the number of protons from the mass number.
d) Add the mass number to the number of electrons.
How many protons, electrons, and neutrons does an atom with atomic number 55 and mass number 130 contain?
a) 55 protons, 55 electrons, 75 neutrons
b) 75 electrons, 55 protons, 55 neutrons
c) 125 neutrons, 55 protons, 75 electrons
d) 70 neutrons, 75 protons, 55 electrons
All atoms of the same element have the same _________.
a) number of neutrons
b) number of electrons
c) number of protons
d) atomic number
What does the number 128 in the name Iodine-128 represent?
a) the mass number
b) the atomic number
c) the sum of the protons and electrons
d) twice the number of protons
The atomic number of an element is the total number of which particles in the nucleus
a) neutrons
b) protons
c) electrons
d) protons and electrons
The total number of protons and neutrons in the nucleus of an atom is called the ___________________
a) atomic number
b) atomic mass unit
c) atomic mass
d) mass number
All atoms are _______________.
a) positively charged, with the number of protons exceeding the number of electrons
b) negatively charged, with the number of electrons exceeding the number of protons
c) neutral, with the number of protons equaling the number of electrons
d) neutral, with the number of protons equaling the number of electrons, which is equal to the number of neutrons
Atoms with the same number of protons, but different numbers of neutrons in the nucleus of an atom are called ________________.
a) atomic number
b) isotopes
c) mass number
d) ions
The smallest particle of an element that retains the properties of that element is a(n)
a) atom
b) electron
c) proton
d) neutron
Which of the following is true about subatomic particles?
a) Electrons are negatively charged and are the heaviest subatomic particle.
b) Protons are positively charged and the lightest subatomic particle.
c) Neutrons have no charge and are the lightest subatomic particle.
d) The mass of a neutron nearly equals the mass of a proton.
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