Fránsíọ̀m

Lát'ọwọ́ Wikipedia, ìwé ìmọ̀ ọ̀fẹ́
(Àtúnjúwe láti Francium)
Lọ sí: atọ́ka, àwárí
Francium
87Fr
Cs

Fr

Uue
radonfranciumradium
Ìhànsójú
metallic
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà francium, Fr, 87
Ìpèlóhùn /ˈfrænsiəm/
FRAN-see-əm
Ẹ̀ka ẹ́límẹ̀nti alkali metal
Ẹgbẹ́, àsìkò, àdìpò 17, s
Ìwúwo átọ́mù (223)
Ìtòléra ẹ̀lẹ́ktrónì [Rn] 7s1
2, 8, 18, 32, 18, 8, 1
Physical properties
Phase solid
Density (near r.t.) 1.87 g·cm−3
Melting point  ? 300 K, ? 27 °C, ? 80 °F
Boiling point  ? 950 K, ? 677 °C, ? 1250 °F
Heat of fusion ca. 2 kJ·mol−1
Heat of vaporization ca. 65 kJ·mol−1
Vapor pressure (extrapolated)
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 404 454 519 608 738 946
Atomic properties
Oxidation states 1 (strongly basic oxide)
Electronegativity 0.7 (Pauling scale)
Ionization energies 1st: 380 kJ·mol−1
Covalent radius 260 pm
Van der Waals radius 348 pm
Miscellanea
Crystal structure cubic body-centered
Francium has a cubic body-centered crystal structure
Magnetic ordering Paramagnetic
Electrical resistivity 3 µΩ·m
Thermal conductivity 15 W·m−1·K−1
CAS registry number 7440-73-5
Àwọn ísótòpù dídúró jùlọ
Main article: Àwọn ísótòpù francium
iso NA half-life DM DE (MeV) DP
221Fr syn 4.8 min α 6.457 217At
222Fr syn 14.2 min β 2.033 222Ra
223Fr trace 22.00 min β 1.149 223Ra
α 5.430 219At
· r

Fránsíọ̀m tabi Francium, mimo tele bi eka-caesium ati actinium K,[akiyesi 1] je apilese kemika to ni ami-idamo Fr ati nomba atomu 87. O ni ikan ninu awon odionina tokerejulo larin gbogbo awon apilese ti a mo, bakanna ohun ni apilese aladanida keji tosowonjulo (leyin astatine). Fransiom je onide to je radioalagbara giga to n jera si astatine, radium, ati radon. Gege bi onide alkali, o ni agbara elektroni kan.

Francium je wiwari latowo Marguerite Perey ni Fransi (nibi ti apilese yi ti ri oruko) ni 1939. Ohun ni apilese togbeyin ti o je wiwari ninu adanida, kanran jije sisopapo.[akiyesi 2] Lode yara ise-idanwo, francium sowon gidigidi, iye ipase je wiwari ninu alumoni aladalu uranium ati thorium, nibi ti isotopu francium-223 ti n je didasile to si n je jijera bibaun. Iye to kere bi 20–30 g (ounce kan) lowa nigba yiowu kakiri inu igbele Aye; awon isotopu yioku je alasopapo yanyan. Iye titobijulo ti o je kikojo lai isotopu yiowu ni isupo bi awon atomu 10,000 (ti francium-210) ti won je didasaye gege bi efuufu tutugidi ni Stony Brook ni 1997.[1]


Awon akiyesile[àtúnṣe | àtúnṣe àmìọ̀rọ̀]

  1. Actually the least unstable isotope, francium-223
  2. Awon apilese alasopapo, bi technetium, ti je wiwari ninu adanida.

Itokasi[àtúnṣe | àtúnṣe àmìọ̀rọ̀]

  1. CRC Handbook of Chemistry and Physics. 4. CRC. 2006. p. 12. ISBN 0-8493-0474-1.