Rubidium

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Rubidium
37Rb
K

Rb

Cs
kryptonrubidiumstrontium
Ìhànsójú
grey white
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà rubidium, Rb, 37
Ìpèlóhùn /rʉˈbɪdiəm/ roo-BID-ee-əm
Ẹ̀ka ẹ́límẹ̀nti alkali metal
Ẹgbẹ́, àsìkò, àdìpò 15, s
Ìwúwo átọ́mù 85.4678(3)
Ìtòléra ẹ̀lẹ́ktrónì [Kr] 5s1
2, 8, 18, 8, 1
Physical properties
Phase solid
Density (near r.t.) 1.532 g·cm−3
Liquid density at m.p. 1.46 g·cm−3
Melting point 312.46 K, 39.31 °C, 102.76 °F
Boiling point 961 K, 688 °C, 1270 °F
Critical point (extrapolated) 2093 K, 16 MPa
Heat of fusion 2.19 kJ·mol−1
Heat of vaporization 75.77 kJ·mol−1
Molar heat capacity 31.060 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 434 486 552 641 769 958
Atomic properties
Oxidation states 1
(strongly basic oxide)
Electronegativity 0.82 (Pauling scale)
Ionization energies 1st: 403 kJ·mol−1
2nd: 2632.1 kJ·mol−1
3rd: 3859.4 kJ·mol−1
Atomic radius 248 pm
Covalent radius 220±9 pm
Van der Waals radius 303 pm
Miscellanea
Crystal structure body-centered cubic
Rubidium has a body-centered cubic crystal structure
Magnetic ordering paramagnetic[1]
Electrical resistivity (20 °C) 128 nΩ·m
Thermal conductivity 58.2 W·m−1·K−1
Speed of sound (thin rod) (20 °C) 1300 m·s−1
Young's modulus 2.4 GPa
Bulk modulus 2.5 GPa
Mohs hardness 0.3
Brinell hardness 0.216 MPa
CAS registry number 7440-17-7
Àwọn ísótòpù dídúró jùlọ
Main article: Àwọn ísótòpù rubidium
iso NA half-life DM DE (MeV) DP
83Rb syn 86.2 d ε - 83Kr
γ 0.52, 0.53,
0.55
-
84Rb syn 32.9 d ε - 84Kr
β+ 1.66, 0.78 84Kr
γ 0.881 -
β 0.892 84Sr
85Rb 72.168% 85Rb is stable with 48 neutrons
86Rb syn 18.65 d β 1.775 86Sr
γ 1.0767 -
87Rb 27.835% 4.88 × 1010 y β 0.283 87Sr
· r


Itokasi[àtúnṣe | àtúnṣe àmìọ̀rọ̀]

  1. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.