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  1. Plutonium (24623 bytes)
    37: | [[Atomic radius]] (calc.)
    40: | [[Covalent radius]]
    43: | [[van der Waals radius]]
    174: ...ond dropped on [[Nagasaki, Nagasaki|Nagasaki]], [[Japan]]).
    232: ...his sort have occurred in the [[Soviet Union]], [[Japan]], and many other countries. (See [[List of nu...
  2. Polonium (10219 bytes)
    29: <td>[[Atomic radius]] (calc.) </td><td>190 (13...
    31: <td>[[Covalent radius]] </td><td>no data</...
    33: <td>[[van der Waals radius]] </td><td>no data</td></...
  3. Potassium (12496 bytes)
    29: <td>[[Atomic radius]] (calc.) </td><td>220 (24...
    31: <td>[[Covalent radius]] </td><td>196 pm</t...
    33: <td>[[van der Waals radius]] </td><td>275 pm</td></t...
  4. Praseodymium (9138 bytes)
    35: | [[Atomic radius]] (calc.)
    38: | [[Covalent radius]]
    41: | [[van der Waals radius]]
  5. Promethium (9561 bytes)
    35: | [[Atomic radius]] (calc.)
    38: | [[Covalent radius]]
    41: | [[van der Waals radius]]
    162: ...tence of promethium was obtained in [[1945]] by [[Jacob A. Marinsky]], [[Lawrence E. Glendenin]] and [...
  6. Protactinium (7744 bytes)
    35: | [[Atomic radius]] (calc.)
    38: | [[Covalent radius]]
    41: | [[van der Waals radius]]
    156: ...as first identified in [[1913]], when [[Kasimir Fajans]] and [[O. H. G?ng]] encountered short-lived is...
  7. Radon (12616 bytes)
    34: | [[Atomic radius]] (calc.)
    37: | [[Covalent radius]]
    40: | [[van der Waals radius]]
    140: ...ng]]s. The towns of [[Misasa, Tottori|Misasa]], [[Japan]], and [[Bad Kreuznach]], [[Germany]] boast th...
    162: ...here are still radon baths and [[hot spring]]s in Japan. These baths promote radon by saying that it c...
  8. Radium (13138 bytes)
    28: <td>[[Atomic radius]]</td><td>215 [[picometre|pm]]</td></tr>
    30: <td>[[Covalent radius]]</td><td>no data</td></tr>
    32: <td>[[van der Waals radius]]</td><td>no data</td></tr>
    110: Radium (Latin radius, ray) was [[discovery of the chemical elements|di...
  9. Rhenium (8807 bytes)
    32: <td>[[Atomic radius]] (calc.)</td><td>135 (188) [[picometre|pm]]</td>...
    34: <td>[[Covalent radius]]</td><td>159 pm</td></tr>
    36: <td>[[van der Waals radius]]</td><td>no data</td></tr>
  10. Rhodium (8753 bytes)
    36: | [[Atomic radius]] (calc.)
    39: | [[Covalent radius]]
    42: | [[van der Waals radius]]
  11. Rubidium (10211 bytes)
    34: | [[Atomic radius]] (calc.)
    37: | [[Covalent radius]]
    40: | [[van der Waals radius]]
  12. Ruthenium (10241 bytes)
    36: | [[Atomic radius]] (calc.)
    39: | [[Covalent radius]]
    42: | [[van der Waals radius]]
  13. Samarium (10157 bytes)
    35: | [[Atomic radius]] (calc.)
    38: | [[Covalent radius]]
    41: | [[van der Waals radius]]
  14. Scandium (10820 bytes)
    28: <td>[[Atomic radius]] (calc.) </td><td>[[1 E-10 m|160 (184) pm]]</td>...
    30: <td>[[Covalent radius]] </td><td>144 [[picometre|pm]]</td></tr>
    32: <td>[[van der Waals radius]] </td><td>no data</td></tr>
  15. Selenium (9236 bytes)
    37: | [[Atomic radius]] (calc.)
    40: | [[Covalent radius]]
    43: | [[van der Waals radius]]
    194: ...meaning "Moon") was discovered in [[1817]] by [[J?Jakob Berzelius]] who found the element associated w...
  16. Silver (15157 bytes)
    35: | [[Atomic radius]] (calc.)
    38: | [[Covalent radius]]
    41: | [[van der Waals radius]]
  17. Strontium (11493 bytes)
    34: | [[Atomic radius]]
    37: | [[Covalent radius]]
    40: | [[van der Waals radius]]
    196: ...235 and 540 &deg;C. Strontium metal (98% pure) in January [[1990]] cost about $5/oz. The largest comme...
    202: ...investigations. Because strontium has an [[atomic radius]] similar to that of [[calcium]], it readily subs...
  18. Tantalum (11817 bytes)
    34: | [[Atomic radius]] (calc.)
    37: | [[Covalent radius]]
    40: | [[van der Waals radius]]
  19. Tellurium (8984 bytes)
    35: | [[Atomic radius]] (calc.)
    38: | [[Covalent radius]]
    41: | [[van der Waals radius]]
  20. Technetium (32113 bytes)
    36: | [[Atomic radius]] (calc.)
    39: | [[Covalent radius]]
    42: | [[van der Waals radius]]
    220: ...ipponium, after [[Japan]] (which is ''Nippon'' in Japanese). Later analysis indicated the presence of ...

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