Biological half-life is the time required for
A. half of an ionic compound to ionize.B. half of a radioactive material to be eliminated from the body.C.
radioactivity levels of organic compounds to stabilize at one-half their original value.
D. radiation exposure that is lethal for half of a biological population.
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Question 2) On the periodic table, beryllium sits above magnesium and to the right of lithium. Given that magnesium has two electrons in its outer shell and lithium has one, how many electrons would you predict beryllium has in its outer shell?
A. One B. Two C. Three D. Four
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Question 3) Two atoms that differ only in the number of neutrons they contain are known as
A. anions.B. isomers.C. isotopes.D. ions.
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Question 4) Radioisotopes contain
A. an insufficient number of neutrons.B. an insufficient number of electrons.C. an insufficient number of protons.D. an excess of protons.E. an excess of neutrons.
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Question 5) When diagramming an atom, how many electrons can fit in each of the shells beyond the innermost shell?
A. Two B. Six C. Eight D. Ten
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Question 6) Two atoms that have the same chemical characteristics but different atomic masses are considered __________.
Fill in the blank with correct word.
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Question 7) All isotopes of a given element have the same atomic mass.
Indicate whether this statement is true or false.
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Question 8) Explain how the structure of an oxygen atom with an atomic mass of sixteen would be diagrammed. Include the number of subatomic particles in each part of the atom.
What will be an ideal response?
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Question 9) The number of neutrons in an atom can be determined by
A. subtracting the atomic number from the atomic mass.B. subtracting the atomic mass from the atomic number.C. adding the atomic mass to the atomic number.D. adding the number of protons to the number of electrons.E. adding the number of protons to the atomic number.
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Question 10) When diagramming an atom, the innermost shell is filled with ______ electrons.
A. two B. six C. eight D. ten
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