True/False
Indicate whether the sentence or statement is true
or false.
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| 1. | Carbon-12 and carbon-14 have different atomic numbers.
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| 2. | Radiation can be produced if a nucleus decays.
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| 3. | Francium is the most reactive element.
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Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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| 4. | The
atomic theory was given by a. | J.J. Thompson | c. | John Dalton | b. | Earnest
Rutherford | d. | James
Chadwick | | | | |
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| 5. | As a
result of Rutherfords experiment it was concluded that a. | Most of the atom
is empty | c. | The center of
the atom has a negative charge | b. | The center of the atom is
empty | d. | Atomic mass is
spread over the whole atom | | | | |
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| 6. | The
smallest part of an element which can take part in a chemical reaction and may or may not exist
independently is the a. | nucleus | c. | compound | b. | neutron | d. | atom | | | | |
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| 7. | The
particle discovered as a result of the cathode ray tube experiment is a. | Proton | c. | Electron | b. | Neutron | d. | Nucleus | | | | |
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| 8. | The
charge of an electron was discovered by a. | J.J.Thompson | c. | Millikan | b. | Faraday | d. | Goldstein | | | | |
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| 9. | Neutron was discovered by a. | Chadwick | c. | John Dalton | b. | J.J.Thompson | d. | Goldstein | | | | |
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| 10. | Atomic number of an element is equal to a. | The number of
protons plus neutrons | c. | The number of
protons in an atom | b. | The number of protons plus
electrons | d. | The number of
neutrons in an atom | | | | |
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| 11. | The
_______________ constitute(s) most of the volume of an atom a. | Protons | c. | Nucleus | b. | Neutrons | d. | Electron Cloud | | | | |
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| 12. | The
nucleus of atoms is made of a. | Protons and Electrons | c. | Neutrons and Electrons | b. | Protons and
Neutrons | d. | Electrons and
Protons | | | | |
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| 13. | Isotopes are atoms of the same element but different a. | The atomic
number | c. | The number of
neutrons in the nucleus | b. | The number of protons in the
nucleus | d. | the number of
electrons | | | | |
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| 14. | In
the hydrogen atom when an excited electron drops from the 5th energy level to the 2nd energy
level we obtain a / an a. | absorption spectra | d. | fine spectra | b. | emission
spectra | e. | none of the
above | c. | line spectra | | | | |
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| 15. | Electron affinity increases as you go from left to right on the periodic table
because a. | atomic radius
decreases | d. | all of the
above | b. | ionization energy decreases | e. | none of the above | c. | of the periodic
law | | | | |
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| 16. | When
elements are arranged in order of increasing atomic mass, their chemical properties repeat at regular
intervals. This statement is the definition of a. | atomic
mass | d. | law of constant
composition | b. | periodic law | e. | law of conservation of mass | c. | limitations of
the periodic table | | | | |
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| 17. | The
mass listed for each element in the periodic table is a. | the mass of all
of the isotopes of the element combined | b. | the mass of the average number of neutrons in all of the
isotopes of the element | c. | the average of the atomic masses of all of the isotopes of the
element | d. | the exact mass of the protons and neutrons in the most common
isotope of the element | e. | the weighted average of the atomic masses of all of the
isotopes of the element | | |
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| 18. | Why
is it easier to remove an electron from potassium than it is to remove an electron from
calcium? a. | Potassium has a
higher electron affinity. | b. | Potassium has a higher ionization
energy. | c. | Potassium has a lower nuclear charge. | d. | Calcium has a
lower electron affinity. | e. | Calcium is a metal, but potassium is
not. | | |
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| 19. | Electronegativity is derived from a. | ionization energies | d. | all of the above | b. | electron
affinity | e. | none of the
above | c. | reactivity | | | | |
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Completion
Complete each sentence or
statement.
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| | 20. | Two
elements have electron affinities of 0.75 eV and 1.4 eV. The first element is ____________________
likely to form a negative ion than the second.
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| | 21. | Uranium-235 is used as fuel in ____________________ nuclear reactors.
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| | 22. | CANDU
nuclear reactors use ____________________ as a moderator.
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Short Answer
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| | 23. | a) What is the relationship between the principal energy level (n) and the
number of orbitals found at that level?
b) What is the maximum number of
electrons allowed in any orbital?
c) How do you determine the
number of orientations for a particular orbital?
d) What does 2n2 stand
for?
e) How many subshells are available in the
4th energy level? How many orbitals are present in each of the subshells? Name each of the
orbitals.
f) Why does the M shell in Bohr theory really contain 18
electrons while the N shell really contains 32 electrons?
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| | 24. | Write the electron configurations of the
following:
a) selenium
b) vanadium
c) chromium
d) nickel
e) copper
f) strontium
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