Radyo

Radium
88Ra
Ba ↑ Ra ↓ Ubn Periodic table francium ← radium → actinium
Appearance
silvery white metallic
General properties
Name, simbolo, kaiphan	radium, Ra, 88
Pronunciation	Plantilya:IPAc-en Plantilya:Respell
Element category	puthaw
Group, period, block	2, 7, s
Standard atomic weight	(226)
Electron configuration	[Rn] 7s2 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
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

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.

Galeriya sa hulagway

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