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| 1 |
How many protons and electrons are
in an atom of lithium? |
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3 |
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4 |
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6 |
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7 |
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None of the previous answers. |
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| 2 |
How many protons and electrons are
in an atom of argon? |
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21 |
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39 |
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40 |
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22 |
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None of the previous answers. |
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| 3 |
How many protons and electrons are
in an atom of copper? |
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63.546 |
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29 |
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64 |
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35 |
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None of the previous answers. |
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| 4 |
How many protons and electrons are
in an atom of aluminum? |
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27 |
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14 |
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13 |
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26 |
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None of the previous answers. |
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| 5 |
How many protons and electrons are
in an atom of bromine? |
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80 |
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45 |
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44 |
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35 |
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None of the previous answers. |
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| 6 |
How many protons and electrons are
in an atom of uranium? |
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238 |
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92 |
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146 |
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6.023x1023 |
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None of the previous answers. |
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| 7 |
What is the average number of
neutrons in an atom of fluorine? |
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9 |
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19 |
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10 |
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18.998 |
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None of the previous answers. |
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| 8 |
What is the average number of
neutrons in an atom of chromium? |
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24 |
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28 |
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52 |
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27 |
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None of the previous answers. |
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| 9 |
What is the average number of
neutrons in an atom of uranium? |
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146 |
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238 |
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92 |
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143 |
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None of the previous answers. |
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| 10 |
How many protons and electrons
respectively are in Na+? |
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12, 11 |
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12, 13 |
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11, 12 |
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11, 10 |
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None of the previous answers. |
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| 11 |
How many protons and electrons
respectively are in Ca2+? |
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20, 18 |
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18, 20 |
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22, 20 |
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20, 20 |
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None of the previous answers. |
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| 12 |
How many protons and electrons
respectively are in Cl-? |
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17, 16 |
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17, 17 |
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18, 19 |
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16, 17 |
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None of the previous answers. |
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| 13 |
How many protons and electrons
respectively are in Fe+3? |
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23, 26 |
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23, 23 |
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23, 20 |
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26, 23 |
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None of the previous answers. |
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| 14 |
How many protons and electrons
respectively are in S-2? |
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16, 16 |
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16, 14 |
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14, 16 |
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16, 18 |
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None of the previous answers. |
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| 15 |
What is the average number of
neutrons in Al3+? |
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14 |
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13 |
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10 |
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27 |
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None of the previous answers. |
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| 16 |
What is the average number of
neutrons in F-? |
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19 |
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10 |
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9 |
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11 |
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None of the previous answers. |
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| 17 |
How many neutrons are in an atom of
chlorine? |
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17 |
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18 |
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An average of about 18.45 |
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18.45 |
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None of the previous answers. |
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| 18 |
How many neutrons are in an atom of
bismuth? |
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83 |
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An average of 126 |
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126 |
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125 |
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None of the previous answers. |
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| 19 |
From the periodic table, what can
you conclude about the number of isotopes of fluorine that are found on earth? |
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There is only one. |
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2 |
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more than 2 |
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It is highly probable that there is only one or a huge predominance of
one. |
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None of the previous answers. |
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| 20 |
From the periodic table, what can
you conclude about the number of isotopes of chlorine that are found on earth? |
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probably two or more |
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2 |
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more than 2 |
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It is highly probable that there is only one. |
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None of the previous answers. |
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| 21 |
From the periodic table, what can
you conclude about the number of isotopes of bromine that are found on earth? |
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2 |
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Probably two or more. |
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more than 2 |
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It is highly probable that there is only one. |
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None of the previous answers. |
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| 22 |
From the periodic table, what can
you conclude about the number of isotopes of copper that are found on earth? |
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1 |
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2 |
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probably 2 or more |
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It is highly probable that there is only one. |
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None of the previous answers. |
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| 23 |
Which pair are isotopes? |
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Fe2+ and Fe3+ |
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239U and 239Pu |
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N and N2 |
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16O and 17O |
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none of the above |
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| 24 |
Which of the following would
probably be a stable isotope of phosphorous? |
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28P |
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31P |
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34P |
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31S |
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None of the previous answers. |
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| 25 |
Which of the following would
probably be a stable isotope of scandium? |
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40Sc |
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45Sc |
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50P |
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45K |
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None of the previous answers. |
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| 26 |
Which of the following would
probably be a radioactive isotope of scandium? |
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40Sc |
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45Sc |
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45Sc3+ |
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45K |
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None of the previous answers. |
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| 27 |
Which of the following would
probably be a radioactive isotope of iodine? |
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127I |
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I2 |
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139I |
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79Br |
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None of the previous answers. |
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| 28 |
The atomic masses and percentage as
found on earth of the isotopes of lithium are: 6.01512, 7.59% and 7.01600, 92.41%. To 4
significant figures, what atomic mass should appear in the periodic table for lithium? |
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7.000 |
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3.000 |
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6.516 |
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6.941 |
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None of the previous answers! |
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| 29 |
The atomic masses and percentage as
found on earth of the isotopes of tungsten are: 179.946701, 0.12%; 181.948202, 26.50%;
182.950220, 14.31%; 183.950928, 30.64%; 185.954357. To 5 significant figures, what atomic
mass should appear in the periodic table for tungsten? |
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74 |
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182.95 |
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183.84 |
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109.84 |
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None of the previous answers! |
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| 30 |
Which of the following would
probably be a stable isotope of technetium? |
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98Tc |
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43Tc |
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55Tc |
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100Tc |
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None of the previous answers. |
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| 31 |
Which of the following would
probably be a stable isotope of thorium? |
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90Th |
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232Th |
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142Th |
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There are no absolutely stable isotopes of thorium. |
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None of the previous answers. |
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| 32 |
On February 29, 2002, a Modesto
Junior College chemistry class will discover a new element, Modestonium (Mm) with atomic
number 124. The element will have a colorful electron shell and a tasty nucleus. Mass
spectrometric analysis will reveal that the element consists of 80.00% 314.0Mm
and 20.00% 312.0Mm. What atomic mass will appear for Mm in the periodic table? |
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313.6 |
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313 |
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| 33 |
Which statement below is correct? |
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Up to an atomic mass of 20, the number of protons and
neutrons are about equal. |
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An isotope with 60 protons and 60 neutrons should be stable. |
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Tin probably has only one naturally occurring stable isotope. |
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Radon has several stable isotopes. |
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None of the previous answers. |
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| 34 |
235U is a fissionable
isotope of uranium and is used in nuclear reactors. 238U does not undergo
fission. Based on the atomic mass of uranium in the periodic chart, which statement is
true? |
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Naturally occurring uranium should be useable in nuclear
reactors. |
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A difficult and expensive extraction and concentration of 235U
is necessary from natually occurring uranium before it can be used in nuclear reactors. |
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There is no fissionble uranium in naturally occurring uranium. |
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There is only one naturally occurring isotope of uranium. |
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None of the previous answers. |
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| 35 |
Except for small but very important
small differences in rates of chemical reactions, isotopes (of the same element) behave
almost identically in chemical reactions (in sharp contrast, nuclear stability is very
dependent on the neutron to proton ratio). The very significant exception to this
observation is that replacement of hydrogen-1 by hydrogen-2 (deuterium) can result in rate
changes of as much as a factor of seven in chemical reactions. Why is it that hydrogen
isotopes have such a large rate difference when intimately involved in a chemical
reaction? |
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Hydrogen is diatomic. |
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Hydrogen is a gas. |
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The isiotopes of hydrogen differ in mass by a factor of 2 whereas most
isotopes differ in mass by a small percentage. |
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Hydrogen is the most abundant element (90%) in the universe. |
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None of the previous answers. |
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