Mendeleev's Periodic Table > Tb - Terbium

Tb - Terbium

Terbium was discovered by Mosander in 1843 in Stockholm. One of four elements named for the Swedish town of Ytterby. Terbium is reasonably stable in air. It is a silvery-grey metal, and is malleable, ductile, and soft enough to be cut with a knife. It is a rare earth metal found in cerite, gadolinite and monazite. The element itself was isolated only recently.

Atomic number	-	65		Density	g/mL	8	.27
Atomic weight	u	158	.9254	Melting point	K	1630
Bonding radius	A	1	.59	Boiling point	K	3496
Atomic radius	A	2	.51	Heat of vaporization	kJ/mol	330	.9
Ionization Potential	V	5	.86	Heat of fusion	kJ/mol	10	.8
Electronegativity	-	1	.2	Specific heat	J/gK	0	.18
The oxide is a weak base.				Crystal are hexagonal.
Electron config. : [Xe] 4f⁹ 6s²

Isotopes of Tb (Terbium):

MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	140 2.4 sec EC/p,10.800 Gd-140/Gd-139 139.94557	141 3.5 sec EC,8.300 MeV Gd-141 140.94116	142 597 msec EC/ECp,10.100 Gd-142/Eu-141 141.93870	143 12 sec EC,7.400 MeV Gd-143 142.93451
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	144 1 sec EC,8.900 MeV Gd-144 143.93236	145 31.6 sec EC,6.510 MeV Gd-145 144.92867	146 8 sec EC,8.080 MeV Gd-146 145.92697	147 1.7 hr EC,4.609 MeV Gd-147 146.92403
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	148 60 min EC,5.690 MeV Gd-148 147.92421	149 4.118 hr a/EC,3.636 Eu-145/Gd-149 148.92324	150 3.48 hr a/EC,4.656 Eu-146/Gd-150 149.92365	151 17.609 hr a/EC,2.565 Eu-147/Gd-151 150.92309
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	151a 25 sec EC,2.664 MeV Gd-151 150.92320	152 17.5 hr a/EC,3.990 Eu-148/Gd-152 151.92406	153 2.34 da EC,1.570 MeV Gd-153 152.92343	154 21.5 hr B-/EC,3.560 Dy-154/Gd-154 153.92469
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	155 5.32 da EC,1.627 MeV Gd-155 154.92350	156 5.35 da B-/EC,2.444 Dy-156/Gd-156 155.92474	157 71 yr EC,1.363 MeV Gd-157 156.92402	158 180 yr B-/EC,1.220 Dy-158/Gd-158 157.92541
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	158a 10.70 sec EC,1.330 MeV Gd-158 157.92552	159 100% Stable 158.92534	160 72.3 da B-,1.835 MeV Dy-160 159.92716	161 6.88 da B-,1.956 MeV Dy-161 160.92756
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	162 7.60 min B-,2.510 MeV Dy-162 161.92948	163 19.5 min B-,1.785 MeV Dy-163 162.93064	164 3.0 min B-,3.890 MeV Dy-164 163.93334	165 2.11 min B-,3.000 MeV Dy-165 164.93483

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