Mendeleev's Periodic Table > Ce - Cerium

Ce - Cerium

Cerium is a rare earth element, named after the planetoid Ceres which was found the year before cerium was discovered, 1803, by Berzelius and Hisinger. Pure cerium was produced in 1875 by Hillebrand and Norton.
Metallic cerium is prepared by reduction techniques, such as by reducing cerous fluoride with calcium, or by electrolysis of molten cerous chloride or other cerous halides.
Cerium is an iron-grey lustrous metal. It is malleable, and oxidises very readily at room temperature, especially in moist air. Except for europium, cerium is the most reactive of the rare-earth metals. It slowly decomposes in cold water, and rapidly in hot water. Alkali solutions and dilute and concentrated acids attack the metal rapidly. The pure metal may ignite when scratched with a knife.
It is the most abundant of the rare earth metals and is found in minerals including allanite, monazite, cerite, and bastnaesite. There are large deposits found in India, Brazil and the USA.

Atomic number	-	58		Density	g/mL	6	.78
Atomic weight	u	140	.12	Melting point	K	1071
Bonding radius	A	1	.65	Boiling point	K	3699
Atomic radius	A	2	.7	Heat of vaporization	kJ/mol	414
Ionization Potential	V	5	.54	Heat of fusion	kJ/mol	5	.46
Electronegativity	-	1	.12	Specific heat	J/gK	0	.19
The oxide is mildly basic.				Crystal are face centered cubic.
Electron config. : [Xe] 4f¹ 5d¹ 6s²

Isotopes of Ce (Cerium):

MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	123 3.8 sec EC/ECp,8.600 La-123/Ba-122 122.93548	124 6 sec EC,5.600 MeV La-124 123.93054	125 9.0 sec EC/ECp,7.300 La-125/Ba-124 124.92850	126 50 sec EC,4.400 MeV La-126 125.92410
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	127 31 sec EC,6.100 MeV La-127 126.92270	128 3 min EC,3.200 MeV La-128 127.91884	129 3.5 min EC,5.050 MeV La-129 128.91808	130 25 min EC,2.200 MeV La-130 129.91468
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	131 10.2 min EC,4.000 MeV La-131 130.91443	132 3.51 hr EC,1.290 MeV La-132 131.91148	133 97 min EC,2.900 MeV La-133 132.91155	134 3.16 da EC,3.710 MeV La-134 133.90902
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	135 17.7 hr EC,2.026 MeV La-135 134.90914	136 0.19% Stable 135.90714	137 9.0 hr EC,1.222 MeV La-137 136.90778	138 0.25% Stable 137.90598
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	139 137.640 da EC,2.317 MeV La-139 138.90664	140 88.48% Stable 139.90543	141 32.501 da B-,2.502 MeV Pr-141 140.90827	142 11.08% 5E+16 yr 2B-,4.505 MeV Nd-142 141.90924
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	143 33.039 hr B-,1.462 MeV Pr-143 142.91238	144 284.893 da B-,5.540 MeV Pr-144 143.91364	145 3.01 min B-,2.540 MeV Pr-145 144.91722	146 13.52 min B-,1.040 MeV Pr-146 145.91873
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	147 56.4 sec B-,3.290 MeV Pr-147 146.92251	148 56 sec B-,2.060 MeV Pr-148 147.92439	149 5.3 sec B-,4.190 MeV Pr-149 148.92828	150 4.0 sec B-,3.010 MeV Pr-150 149.93023
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	151 1.02 sec B-,5.400 MeV Pr-151 150.93408	152 1.4 sec B-,4.500 MeV Pr-152 151.93633

url: www.digitalexandria.com | mail:
Web Engineering: Alessandro Tugnoli, Alessandro Yoshi Polliotti, Daniele De Matteis | Graphic Design: Daniele De Matteis []
© 2003-2006 digitAlexandria