Nd - Neodymium

Baron von Welsbach separated the components of dydimium into neodymium (the new twin) and praseodymium (the green twin) in 1885 in Vienna.

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: Click mass number for decay process, product for element page.

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 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 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 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 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 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 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

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 MASS abund.
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass

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

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	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	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	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	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	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	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
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	MASS abund. Halflife Particle, Energy Decay Product(s) Isotopic Mass