Atomic Theory Practice Test
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
____1.If 6 g of element K combine with 17 g of element L, how many grams of element K combine with 85 g of element L?
a. / 17 g / c. / 30 gb. / 23 g / d. / 91 g
____2.The two oxides of lead, PbO and PbO2, are explained by the
a. / periodic law. / c. / atomic law.b. / law of multiple proportions. / d. / law of conservation of mass.
____3.Which two compounds are examples of the law of multiple proportions?
a. / FeCl3 and Fe2(SO4)3 / c. / CO and CO2b. / O2 and O3 / d. / FeCl2 and Fe(NO3)2
____4.If 3 g of element C combine with 8 g of element D to form compound CD, how many grams of CD are formed?
a. / 8 g / c. / 11 gb. / 16 g / d. / 19 g
____5.If 63.5 g of copper (Cu) combine with 16 g of oxygen (O) to form the compound CuO, how many grams of oxygen will be needed to combine with the same amount of copper to form the compound CuO2?
a. / 16 g / c. / 64 gb. / 32 g / d. / 127 g
____6.The principles of atomic theory recognized today were conceived by
a. / Avogadro. / c. / Dalton.b. / Bohr. / d. / Rutherford.
____7.The rays produced in a cathode tube in early experiments were
a. / unaffected by a magnetic field. / c. / found to carry a positive charge.b. / deflected away from a negative plate. / d. / striking the cathode.
____8.The discovery of the electron resulted from experiments using
a. / gold foil. / c. / neutrons.b. / cathode rays. / d. / alpha particles.
____9.Rutherford fired positively charged particles at metal foil and concluded that most of the mass of an atom was
a. / in the electrons. / c. / evenly spread throughout the atom.b. / concentrated in the nucleus. / d. / in rings around the atom.
____10.The nucleus of an atom has all of the following characteristics EXCEPT that it
a. / is positively charged. / c. / contains nearly all of the atom's mass.b. / is very dense. / d. / contains nearly all of the atom's volume.
____11.The mass of a neutron is
a. / about the same as that of a proton. / c. / double that of a proton.b. / about the same as that of an electron. / d. / double that of an electron.
____12.An atom is electrically neutral because
a. / neutrons balance the protons and electrons.b. / nuclear forces stabilize the charges.
c. / the numbers of protons and electrons are equal.
d. / the numbers of protons and neutrons are equal.
____13.Most of the volume of an atom is occupied by the
a. / nucleus. / c. / electron cloud.b. / nuclides. / d. / protons.
____14.Isotopes are atoms of the same element that have different
a. / principal chemical properties. / c. / numbers of protons.b. / masses. / d. / numbers of electrons.
____15.Isotopes of an element contain different numbers of
a. / electrons. / c. / neutrons.b. / protons. / d. / nuclides.
____16.An Avogadro's constant amount of any element is equivalent to
a. / the atomic number of that element. / c. / 6.022 1023 particles.b. / the mass number of that element. / d. / 100 g of that element.
____17.A quantity of sodium (atomic mass 22.99 amu) contains 6.02 1023 atoms. The mass of the sodium is
a. / 6.02 1023 g. / c. / 22.99 g.b. / 3.88 g. / d. / not determinable.
____18.The mass of a sample containing 3.5 mol of silicon atoms (atomic mass 28.0855 amu) is
a. / 28 g. / c. / 72 g.b. / 35 g. / d. / 98 g.
____19.How many moles of Hydrogen are there if you have 9.03 1024 Hydrogen atoms?
a. / 1.50 mol / c. / 10.0 molb. / 9.03 mol / d. / 15.0 mol
____20.A prospector finds 39.39 g of gold (atomic mass 196.9665 amu). She has
a. / 1.20 1023 atoms. / c. / 4.30 1023 atoms.b. / 2.30 1023 atoms. / d. / 6.02 1023 atoms.
____21.The product of the frequency and the wavelength of a wave equals the
a. / number of waves passing a point in a second.b. / speed of the wave.
c. / distance between wave crests.
d. / time for one full wave to pass.
____22.Visible light, X rays, infrared radiation, and radio waves all have the same
a. / energy. / c. / speed.b. / wavelength. / d. / frequency.
____23.One of the wave properties of electromagnetic radiation, such as light, is
a. / volume. / c. / mass.b. / frequency. / d. / weight.
____24.A line spectrum is produced when an electron moves from one energy level
a. / to a higher energy level.b. / to a lower energy level.
c. / into the nucleus.
d. / to another position in the same sublevel.
____25.If electrons in an atom have the lowest possible energies, the atom is in the
a. / ground state. / c. / excited state.b. / inert state. / d. / radiation-emitting state.
____26.A spherical electron cloud surrounding an atomic nucleus would best represent
a. / an s orbital. / c. / a combination of px and py orbitals.b. / a px orbital. / d. / a combination of an s and a px orbital.
____27.The letter designations for the first four sublevels with the number of electrons that can be accommodated in each sublevel are
a. / s:1, p:3, d:10, and f:14. / c. / s:2, p:6, d:10, and f:14.b. / s:1, p:3, d:5, and f:7. / d. / s:1, p:2, d:3, and f:4.
____28.The number of orbitals for the d sublevel is
a. / 1. / c. / 5.b. / 3. / d. / 7.
____29.A single orbital in the 3d level can hold ____ electrons.
a. / 10 / c. / 3b. / 2 / d. / 6
____30.The atomic sublevel with the next highest energy after 4p is
a. / 4d. / c. / 5p.b. / 4f. / d. / 5s.
Problem
31.Which element has the following electron configuration: [Ar] 4s2 3d10 4p5?
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32.Write the Noble Gas electron configuration for silicon.(Si)
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33.Draw the orbital diagram for phosphorus.
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34.Write the electron configuration for argon, atomic number 18.