| 41. | The mass number is the sum of the number of protons and neutrons in a nucleus.
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| 42. | Molybdenum isotopes with mass numbers 111 and up all have half-lives of approximately . 15 �s.
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| 43. | Pentecostals in mass numbers were given 20-25 year prison terms and many perished there, including Voronaev.
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| 44. | The mass number is a dimensionless quantity.
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| 45. | They have mass numbers of 217 242,
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| 46. | There are panoramic shots of the city that display the mass numbers of race participants and spectators.
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| 47. | Beta decay leaves the mass number unchanged, so that the change of nuclear spin must be an integer.
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| 48. | Radium has 33 known isotopes, with mass numbers from 202 to 234 : all of them are radioactive.
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| 49. | There are 19 isotopes of neptunium with mass numbers from 225 to 244; they are all highly radioactive.
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| 50. | The mass number of this isotope was not clearly established ( possibly 258 or 259 ) at the time.
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