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Isotopes of praseodymium

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Main isotopes^[1]			Decay
Isotope	abundance	half-life(t_1/2)	mode	product
¹⁴¹Pr	100%	stable
¹⁴²Pr	synth	19.12 h	β⁻	¹⁴²Nd
¹⁴²Pr	synth	19.12 h	ε	¹⁴²Ce
¹⁴³Pr	synth	13.57 d	β⁻	¹⁴³Nd

Standard atomic weightA_r°(Pr)

140.90766±0.00001^[2]
140.91±0.01 (abridged)^[3]

Naturally occurringpraseodymium (₅₉Pr) is composed of one stableisotope,¹⁴¹Pr. Fortyradioisotopes have been characterized with the most stable being¹⁴³Pr, with ahalf-life of 13.57 days and¹⁴²Pr, with a half-life of 19.12 hours. All of the remainingradioactive isotopes have half-lives that are less than six hours and the majority of these have half-lives that are less than 33 seconds. This element also has 19meta states with the most stable being^138mPr (2.12 hours),^142mPr (14.6 minutes) and^134mPr (~11 minutes).

The known isotopes of praseodymium range from¹²¹Pr to¹⁶¹Pr. The primary decay mode of isotopes lighter than¹⁴¹Pr ispositron emission orelectron capture toisotopes of cerium, while that of heavier isotopes isbeta decay toisotopes of neodymium.

List of isotopes

[edit]

Nuclide ^{[n 1]}	Z	N	Isotopic mass(Da)^[4] ^{[n 2]}^{[n 3]}	Half-life^[1] ^{[n 4]}	Decay mode^[1] ^{[n 5]}	Daughter isotope ^{[n 6]}^{[n 7]}	Spin and parity^[1] ^{[n 8]}^{[n 4]}	Isotopic abundance
Nuclide ^{[n 1]}	Excitation energy^{[n 4]}			Half-life^[1] ^{[n 4]}	Decay mode^[1] ^{[n 5]}	Daughter isotope ^{[n 6]}^{[n 7]}	Spin and parity^[1] ^{[n 8]}^{[n 4]}	Isotopic abundance
¹²¹Pr	59	62	120.95539(54)#	12(5) ms	p	¹²⁰Ce	(3/2)(+#)
¹²⁴Pr	59	65	123.94294(43)#	1.2(2) s	β⁺	¹²⁴Ce
¹²⁴Pr	59	65	123.94294(43)#	1.2(2) s	β⁺, p (?%)	¹²³La
¹²⁵Pr	59	66	124.93766(32)#	3.3(7) s	β⁺	¹²⁵Ce	3/2+#
¹²⁶Pr	59	67	125.93524(21)#	3.12(18) s	β⁺	¹²⁶Ce	(4, 5)
¹²⁶Pr	59	67	125.93524(21)#	3.12(18) s	β⁺, p (?%)	¹²⁵La	(4, 5)
¹²⁷Pr	59	68	126.93071(21)#	4.2(3) s	β⁺	¹²⁷Ce	3/2+#
^127mPr	600(200)# keV			2# μs			(11/2−)
¹²⁸Pr	59	69	127.928791(32)	2.85(9) s	β⁺	¹²⁸Ce	(3+)
¹²⁸Pr	59	69	127.928791(32)	2.85(9) s	β⁺, p (?%)	¹²⁷La	(3+)
¹²⁹Pr	59	70	128.925095(32)	30(4) s	β⁺	¹²⁹Ce	(3/2+)
^129mPr	382.57(24) keV			26(11)# μs	IT	¹²⁹Pr	(11/2−)
¹³⁰Pr	59	71	129.923590(69)	40.0(4) s	β⁺	¹³⁰Ce	(6, 7)(+#)
^130mPr	100(100)# keV			10# s			2+#
¹³¹Pr	59	72	130.920235(50)	1.50(3) min	β⁺	¹³¹Ce	(3/2+)
^131mPr	152.4(3) keV			5.73(20) s	IT (96.4%)	¹³¹Pr	(11/2−)
^131mPr	152.4(3) keV			5.73(20) s	β⁺ (3.6%)	¹³¹Ce	(11/2−)
¹³²Pr	59	73	131.919240(31)	1.49(11) min	β⁺	¹³²Ce	(2+)
^132m1Pr^{[n 9]}	30(30)# keV			1# s			(5+)
^132m2Pr	250(30)# keV			2.46(4) μs	IT	¹³²Pr	(8+)
^132m3Pr	300(30)# keV			486(70) ns	IT	¹³²Pr	(8−)
¹³³Pr	59	74	132.916331(13)	6.5(3) min	β⁺	¹³³Ce	5/2+
^133mPr	192.12(14) keV			1.1(2) μs	IT	¹³³Pr	(11/2−)
¹³⁴Pr	59	75	133.915697(22)	17(2) min	β⁺	¹³⁴Ce	2−
^134mPr	67.7(4) keV			~11 min	β⁺	¹³⁴Ce	6−
¹³⁵Pr	59	76	134.913112(13)	24(1) min	β⁺	¹³⁵Ce	3/2+
^135mPr	358.06(6) keV			105(10) μs	IT	¹³⁵Pr	(11/2−)
¹³⁶Pr	59	77	135.912677(12)	13.1(1) min	β⁺	¹³⁶Ce	2+
¹³⁷Pr	59	78	136.9106792(87)	1.28(3) h	β⁺	¹³⁷Ce	5/2+
^137mPr	561.22(23) keV			2.66(7) μs	IT	¹³⁷Pr	11/2−
¹³⁸Pr	59	79	137.910757(11)	1.45(5) min	β⁺	¹³⁸Ce	1+
^138mPr	350(19) keV			2.12(4) h	β⁺	¹³⁸Ce	7−
¹³⁹Pr	59	80	138.9089327(39)	4.41(4) h	β⁺	¹³⁹Ce	5/2+
¹⁴⁰Pr	59	81	139.9090856(66)	3.39(1) min	EC (51.3%)	¹⁴⁰Ce	1+
¹⁴⁰Pr	59	81	139.9090856(66)	3.39(1) min	β⁺ (48.7%)	¹⁴⁰Ce	1+
^140m1Pr	127.8(3) keV			0.35(2) μs	IT	¹⁴⁰Pr	5+
^140m2Pr	763.7(5) keV			3.05(20) μs	IT	¹⁴⁰Pr	(7)−
¹⁴¹Pr^{[n 10]}	59	82	140.9076596(16)	Stable			5/2+	1.0000
¹⁴²Pr	59	83	141.9100516(16)	19.12(4) h	β⁻ (99.98%)	¹⁴²Nd	2−
¹⁴²Pr	59	83	141.9100516(16)	19.12(4) h	EC (0.0164%)	¹⁴²Ce	2−
^142mPr	3.694(3) keV			14.6(5) min	IT	¹⁴²Pr	5−
¹⁴³Pr^{[n 10]}	59	84	142.9108226(19)	13.57(2) d	β⁻	¹⁴³Nd	7/2+
¹⁴⁴Pr^{[n 10]}	59	85	143.9133107(29)	17.28(5) min	β⁻	¹⁴⁴Nd	0−
^144mPr^{[n 10]}	59.03(3) keV			7.2(3) min	IT (~99.93%)	¹⁴⁴Pr	3−
^144mPr^{[n 10]}	59.03(3) keV			7.2(3) min	β⁻ (~0.07%)	¹⁴⁴Nd	3−
¹⁴⁵Pr	59	86	144.9145180(77)	5.984(10) h	β⁻	¹⁴⁵Nd	7/2+
¹⁴⁶Pr	59	87	145.917688(37)	24.09(10) min	β⁻	¹⁴⁶Nd	(2−)
¹⁴⁷Pr	59	88	146.919007(17)	13.39(4) min	β⁻	¹⁴⁷Nd	3/2+
¹⁴⁸Pr	59	89	147.922130(16)	2.29(2) min	β⁻	¹⁴⁸Nd	1−
^148mPr	76.80(20) keV			2.01(7) min	β⁻ (64%)	¹⁴⁸Nd	(4)
^148mPr	76.80(20) keV			2.01(7) min	IT (36%)	¹⁴⁸Pr	(4)
¹⁴⁹Pr	59	90	148.923736(11)	2.26(7) min	β⁻	¹⁴⁹Nd	(5/2+)
¹⁵⁰Pr	59	91	149.9266764(97)	6.19(16) s	β⁻	¹⁵⁰Nd	1−
¹⁵¹Pr	59	92	150.928309(13)	18.90(7) s	β⁻	¹⁵¹Nd	(3/2−)
^151mPr	35.10(10) keV			50(8) μs	IT	¹⁵¹Pr	(7/2+)
¹⁵²Pr	59	93	151.931553(20)	3.57(11) s	β⁻	¹⁵²Nd	4+
^152mPr	115.1(3) keV			4.16(10) μs	IT	¹⁵²Pr	(1+)
¹⁵³Pr	59	94	152.933904(13)	4.28(11) s	β⁻	¹⁵³Nd	3/2−#
¹⁵⁴Pr	59	95	153.93789(11)	2.30(9) s	β⁻	¹⁵⁴Nd	(3+)
¹⁵⁵Pr	59	96	154.940509(18)	1.47(3) s	β⁻	¹⁵⁵Nd	3/2−#
¹⁵⁶Pr	59	97	155.9447669(11)	444(6) ms	β⁻	¹⁵⁶Nd	1+#
¹⁵⁷Pr	59	98	156.9480031(34)	307(21) ms	β⁻	¹⁵⁷Nd	3/2−#
¹⁵⁸Pr	59	99	157.95260(32)#	181(14) ms	β⁻	¹⁵⁸Nd	5−#
¹⁵⁹Pr	59	100	158.95623(43)#	134(43) ms	β⁻	¹⁵⁹Nd	3/2−#
¹⁶⁰Pr	59	101	159.96114(43)#	170(140) ms	β⁻	¹⁶⁰Nd	1+#
¹⁶¹Pr	59	102	160.96512(54)#	90# ms [>550 ns]			3/2−#
This table header & footer: view

^^mPr – Excitednuclear isomer.
^( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
^# – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
^^a ^b ^c# – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
^Modes of decay:
EC: Electron capture

IT: Isomeric transition

p: Proton emission
^Bold italics symbol as daughter – Daughter product is nearly stable.
^Bold symbol as daughter – Daughter product is stable.
^( ) spin value – Indicates spin with weak assignment arguments.
^Order of ground state and isomer is uncertain.
^^a ^b ^c ^dFission product

References

[edit]

^^a ^b ^c ^dKondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021)."The NUBASE2020 evaluation of nuclear properties"(PDF).Chinese Physics C.45 (3) 030001.doi:10.1088/1674-1137/abddae.
^"Standard Atomic Weights: Praseodymium".CIAAW. 2017.
^Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04)."Standard atomic weights of the elements 2021 (IUPAC Technical Report)".Pure and Applied Chemistry.doi:10.1515/pac-2019-0603.ISSN 1365-3075.
^Wang, Meng; Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*".Chinese Physics C.45 (3) 030003.doi:10.1088/1674-1137/abddaf.

Isotope masses from:
- Audi, Georges; Bersillon, Olivier; Blachot, Jean;Wapstra, Aaldert Hendrik (2003),"The NUBASE evaluation of nuclear and decay properties",Nuclear Physics A,729:3–128,Bibcode:2003NuPhA.729....3A,doi:10.1016/j.nuclphysa.2003.11.001
Half-life, spin, and isomer data selected from the following sources.
- Audi, Georges; Bersillon, Olivier; Blachot, Jean;Wapstra, Aaldert Hendrik (2003),"The NUBASE evaluation of nuclear and decay properties",Nuclear Physics A,729:3–128,Bibcode:2003NuPhA.729....3A,doi:10.1016/j.nuclphysa.2003.11.001
- National Nuclear Data Center."NuDat 3.0 database".Brookhaven National Laboratory.
- Holden, Norman E. (2004). "11. Table of the Isotopes". In Lide, David R. (ed.).CRC Handbook of Chemistry and Physics (85th ed.).Boca Raton, Florida:CRC Press.ISBN 978-0-8493-0485-9.

Isotopes of thechemical elements

Group	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18
Period	Hydrogen and alkali metals	Alkaline earth metals													Pnictogens	Chalcogens	Halogens	Noble gases
①	Isotopes § List H 1																	Isotopes § List He 2
②	Isotopes § List Li 3	Isotopes § List Be 4											Isotopes § List B 5	Isotopes § List C 6	Isotopes § List N 7	Isotopes § List O 8	Isotopes § List F 9	Isotopes § List Ne 10
③	Isotopes § List Na 11	Isotopes § List Mg 12											Isotopes § List Al 13	Isotopes § List Si 14	Isotopes § List P 15	Isotopes § List S 16	Isotopes § List Cl 17	Isotopes § List Ar 18
④	Isotopes § List K 19	Isotopes § List Ca 20	Isotopes § List Sc 21	Isotopes § List Ti 22	Isotopes § List V 23	Isotopes § List Cr 24	Isotopes § List Mn 25	Isotopes § List Fe 26	Isotopes § List Co 27	Isotopes § List Ni 28	Isotopes § List Cu 29	Isotopes § List Zn 30	Isotopes § List Ga 31	Isotopes § List Ge 32	Isotopes § List As 33	Isotopes § List Se 34	Isotopes § List Br 35	Isotopes § List Kr 36
⑤	Isotopes § List Rb 37	Isotopes § List Sr 38	Isotopes § List Y 39	Isotopes § List Zr 40	Isotopes § List Nb 41	Isotopes § List Mo 42	Isotopes § List Tc 43	Isotopes § List Ru 44	Isotopes § List Rh 45	Isotopes § List Pd 46	Isotopes § List Ag 47	Isotopes § List Cd 48	Isotopes § List In 49	Isotopes § List Sn 50	Isotopes § List Sb 51	Isotopes § List Te 52	Isotopes § List I 53	Isotopes § List Xe 54
⑥	Isotopes § List Cs 55	Isotopes § List Ba 56	Isotopes § List Lu 71	Isotopes § List Hf 72	Isotopes § List Ta 73	Isotopes § List W 74	Isotopes § List Re 75	Isotopes § List Os 76	Isotopes § List Ir 77	Isotopes § List Pt 78	Isotopes § List Au 79	Isotopes § List Hg 80	Isotopes § List Tl 81	Isotopes § List Pb 82	Isotopes § List Bi 83	Isotopes § List Po 84	Isotopes § List At 85	Isotopes § List Rn 86
⑦	Isotopes § List Fr 87	Isotopes § List Ra 88	Isotopes § List Lr 103	Isotopes § List Rf 104	Isotopes § List Db 105	Isotopes § List Sg 106	Isotopes § List Bh 107	Isotopes § List Hs 108	Isotopes § List Mt 109	Isotopes § List Ds 110	Isotopes § List Rg 111	Isotopes § List Cn 112	Isotopes § List Nh 113	Isotopes § List Fl 114	Isotopes § List Mc 115	Isotopes § List Lv 116	Isotopes § List Ts 117	Isotopes § List Og 118
⑧	Isotopes § List Uue 119	Isotopes § List Ubn 120

			Isotopes § List La 57	Isotopes § List Ce 58	Isotopes § List Pr 59	Isotopes § List Nd 60	Isotopes § List Pm 61	Isotopes § List Sm 62	Isotopes § List Eu 63	Isotopes § List Gd 64	Isotopes § List Tb 65	Isotopes § List Dy 66	Isotopes § List Ho 67	Isotopes § List Er 68	Isotopes § List Tm 69	Isotopes § List Yb 70
			Isotopes § List Ac 89	Isotopes § List Th 90	Isotopes § List Pa 91	Isotopes § List U 92	Isotopes § List Np 93	Isotopes § List Pu 94	Isotopes § List Am 95	Isotopes § List Cm 96	Isotopes § List Bk 97	Isotopes § List Cf 98	Isotopes § List Es 99	Isotopes § List Fm 100	Isotopes § List Md 101	Isotopes § List No 102

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