Radiomu

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Radium
88Ra
Ba

Ra

Ubn
franciumradiumactinium
Ìhànsójú
silvery white metallic
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà radium, Ra, 88
Ẹ̀ka ẹ́límẹ̀nti alkaline earth metal
Ẹgbẹ́, àsìkò, àdìpò 27, s
Ìwúwo átọ́mù (226)
Ìtòléra ẹ̀lẹ́ktrónì [Rn] 7s2
2, 8, 18, 32, 18, 8, 2
Physical properties
Phase solid
Density (near r.t.) 5.5 g·cm−3
Melting point 973 K, 700 °C, 1292 °F
Boiling point 2010 K, 1737 °C, 3159 °F
Heat of fusion 8.5 kJ·mol−1
Heat of vaporization 113 kJ·mol−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 819 906 1037 1209 1446 1799
Atomic properties
Oxidation states 2 (strongly basic oxide)
Electronegativity 0.9 (Pauling scale)
Ionization energies 1st: 509.3 kJ·mol−1
2nd: 979.0 kJ·mol−1
Covalent radius 221±2 pm
Van der Waals radius 283 pm
Miscellanea
Crystal structure body-centered cubic
Radium has a body-centered cubic crystal structure
Magnetic ordering nonmagnetic
Electrical resistivity (20 °C) 1 µΩ·m
Thermal conductivity 18.6 W·m−1·K−1
CAS registry number 7440-14-4
Àwọn ísótòpù dídúró jùlọ
Main article: Àwọn ísótòpù radium
iso NA half-life DM DE (MeV) DP
223Ra trace 11.43 d alpha 5.99 219Rn
224Ra trace 3.6319 d alpha 5.789 220Rn
226Ra ~100% 1602 y alpha 4.871 222Rn
228Ra trace 5.75 y beta 0.046 228Ac
· r

Radiomu (pípè /ˈradiəmu/, RAY-dee-əm) je ipilese elegbogi to ni ami-idamo Ra ati nomba atomu 88.


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