| 31. | The mass number is always a whole number and has units of " nucleons ".
|
| 32. | From this bottom, the average binding energy per nucleon slowly decreases with increasing atomic mass number.
|
| 33. | :* according to the IUPAC green book m is a mass and not a mass number.
|
| 34. | For chemical reactions concerning specific isotopes, identify the isotope by its mass number ( A ).
|
| 35. | Molybdenum isotopes with mass numbers from 111 to 117 all have half-lives of approximately 150 ns.
|
| 36. | Sixteen isotopes of mendelevium are known, with mass numbers from 245 to 260; all are radioactive.
|
| 37. | At least 32 metastable isomers have been characterized, ranging in mass number from 164 to 197.
|
| 38. | Twelve isotopes of lawrencium are known, with mass numbers 252 262 and 266; all are radioactive.
|
| 39. | It is the decay of the element Polonium discovered by Marie Curie, with mass number 210.
|
| 40. | Twelve isotopes of nobelium are known, with mass numbers 250 260 and 262; all are radioactive.
|
