Mendeleev's Periodic Table > Nd - Neodymium

Nd - Neodymium

Baron von Welsbach separated the components of dydimium into neodymium (the new twin) and praseodymium (the green twin) in 1885 in Vienna. The metal has a bright silvery metallic lustre. Neodymium is one of the more reactive rare-earth metals and quickly tarnishes in air, forming an oxide that spalls off and exposes the metal to further oxidation. It is one of the rare earth metals.

Atomic number - 60 Density g/mL 7
Atomic weight u 144 .24 Melting point K 1289
Bonding radius A 1 .64 Boiling point K 3341
Atomic radius A 2 .64 Heat of vaporization kJ/mol 273
Ionization Potential V 5 .53 Heat of fusion kJ/mol 7 .14
Electronegativity - 1 .14 Specific heat J/gK 0 .19
The oxide is mildly basic. Crystal are hexagonal.
Electron config. : [Xe] 4f4 6s2

Isotopes of Nd (Neodymium):

MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 127
1.8 sec
EC/ECp,9.000
Pr-127/Ce-126
126.94052 		128

EC,6.100 MeV
Pr-128
127.93537 		129
4.9 sec
EC/ECp,7.800
Pr-129/Ce-128
128.93322 		130
28 sec
EC,5.000 MeV
Pr-130
129.92882
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 131
27 sec
EC/ECp,6.560
Pr-131/Ce-130
130.92710 		132
1.75 min
EC,3.700 MeV
Pr-132
131.92313 		133
70 sec
EC,5.600 MeV
Pr-133
132.92216 		134
8.5 min
EC,2.770 MeV
Pr-134
133.91862
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 135
12.4 min
EC,4.800 MeV
Pr-135
134.91823 		136
50.65 min
EC,2.210 MeV
Pr-136
135.91501 		137
38.5 min
EC,3.690 MeV
Pr-137
136.91464 		138
5.04 hr
EC,1.100 MeV
Pr-138
137.91192
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 139
29.7 min
EC,2.790 MeV
Pr-139
138.91192 		140
3.37 da
EC,3.388 MeV
Pr-140
139.90931 		141
2.49 hr
EC,1.823 MeV
Pr-141
140.90960 		141a
62.0 sec
EC,2.580 MeV
Pr-141
140.91041
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 142 27.13%

Stable

141.90771 		143 12.18%

Stable

142.90980 		144 23.80%
2.29E+15 yr
a,1.905 MeV
Ce-140
143.91008 		145 8.30%

Stable

144.91256
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 146 17.19%

Stable

145.91311 		147
10.98 da
B-,2.690 MeV
Pm-147
146.91609 		148 5.76%

Stable

147.91688 		149
1.728 hr
B-,1.691 MeV
Pm-149
148.92014
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 150 5.64%
1.1E19 yr
B-B-,3.367
Sm-150
149.92088 		151
12.44 min
B-,2.442 MeV
Pm-151
150.92382 		152
11.4 min
B-,1.110 MeV
Pm-152
151.92468 		153
28.9 sec
B-,3.600 MeV
Pm-153
152.92799
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 154
25.9 sec
B-,2.740 MeV
Pm-154
153.92947 		155
8.9 sec
B-,5.000 MeV
Pm-155
154.93344 		156
5.47 sec
B-,4.100 MeV
Pm-156
155.93548


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