Radyo

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Radium
88Ra
Ba

Ra

Ubn
franciumradiumactinium
Appearance
silvery white metallic
General properties
Name, simbolo, kaiphan radium, Ra, 88
Pronunciation Plantilya:IPAc-en
Plantilya:Respell
Element category puthaw
Group, period, block 27, s
Standard atomic weight (226)
Electron configuration [Rn] 7s2
2, 8, 18, 32, 18, 8, 2
Electron shells of radium (2, 8, 18, 32, 18, 8, 2)
History
Discovery Pierre Curie and Marie Curie (1898)
First isolation Marie Curie (1902)
Physical properties
Phase magahi
Density (near r.t.) 5.5 g·cm−3
Melting point 973 K, 700 °C, 1292 °F
Boiling point 2010 K, 1737 °C, 3158.6 °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
Most stable isotopes
Main article: Isotopes of radium
iso NA half-life DM DE (MeV) DP
223Ra trace 11.43 d α 5.99 219Rn
224Ra trace 3.6319 d α 5.789 220Rn
226Ra trace 1601 y α 4.871 222Rn
228Ra trace 5.75 y β 0.046 228Ac
t  h  u
· r

Ang radyo (Iningles radium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Ra ug kaiphan nga atomik 88. Ang radyo mao ang puthaw.

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