| 单词 | roentgenium |
| 释义 | roentgenium[ rent-gen-ee-uhm, -jen-, ruhnt- ] / rɛntˈgɛn i əm, -ˈdʒɛn-, rʌnt- / noun Chemistry, Physics.a superheavy, synthetic radioactive element with a very short half-life. Symbol: Rg; atomic number: 111. Formerly u·nu·nun·i·um [uh-nuh-nuhn-ee-uhm], /ə nəˈnʌn i əm/, el·e·ment 111 . Origin of roentgeniumFirst recorded in 2000–05; named after German physicist Wilhelm Konrad Roentgen. Words nearby roentgeniumRoeg, roemer, Roentgen, roentgen equivalent man, roentgenism, roentgenium, roentgenize, roentgeno-, roentgenogram, roentgenograph, roentgenography Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Scientific definitions for roentgeniumroentgenium [ rĕnt-gĕn′ē-əm, -jĕn′-, rŭnt-, rœnt-gĕn′- ] RgAn artificially produced radioactive element with a mass number of 280. Its most stable known isotope has a half-life of 3.6 seconds. Atomic number 111. See Periodic Table. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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