Platinum-185

Isotopes of platinum (₇₈Pt)
Standard atomic weight Ar°(Pt)
	195.084±0.009; 195.08±0.02 (abridged);
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Isotopes of platinum

Nuclides with atomic number of 78 but with different mass numbers

Naturally occurring platinum (₇₈Pt) consists of five stable isotopes (¹⁹²Pt, ¹⁹⁴Pt, ¹⁹⁵Pt, ¹⁹⁶Pt, ¹⁹⁸Pt) and one very long-lived (half-life 4.83×10¹¹ years) radioisotope (¹⁹⁰Pt). There are also 34 known synthetic radioisotopes, the longest-lived of which is ¹⁹³Pt with a half-life of 50 years. All other isotopes have half-lives under a year, most under a day. All isotopes of platinum are either radioactive or observationally stable, meaning that they are predicted to be radioactive but no actual decay has been observed. Platinum-195 is the most abundant isotope.

Quick Facts Main isotopes, Decay ...

List of isotopes

More information Nuclide, Z ...

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 9]}	Natural abundance (mole fraction)
Nuclide ^{[n 1]}	Excitation energy^{[n 9]}			Half-life^[1] ^{[n 4]}	Decay mode^[1] ^{[n 5]}	Daughter isotope ^{[n 6]}^{[n 7]}	Spin and parity^[1] ^{[n 8]}^{[n 9]}	Normal proportion^[1]	Range of variation
¹⁶⁵Pt	78	87	164.99966(43)#	370(180) μs	α	¹⁶¹Os	7/2−#
¹⁶⁶Pt	78	88	165.99487(32)#	294(62) μs	α	¹⁶²Os	0+
¹⁶⁷Pt	78	89	166.99275(33)#	920(120) μs	α	¹⁶³Os	7/2−#
¹⁶⁸Pt	78	90	167.98818(16)	2.02(10) ms	α	¹⁶⁴Os	0+
¹⁶⁸Pt	78	90	167.98818(16)	2.02(10) ms	β⁺ ?	¹⁶⁸Ir	0+
¹⁶⁹Pt	78	91	168.98662(22)#	6.99(9) ms	α	¹⁶⁵Os	(7/2−)
¹⁶⁹Pt	78	91	168.98662(22)#	6.99(9) ms	β⁺ ?	¹⁶⁹Ir	(7/2−)
¹⁷⁰Pt	78	92	169.982502(20)	13.93(16) ms	α	¹⁶⁶Os	0+
¹⁷⁰Pt	78	92	169.982502(20)	13.93(16) ms	β⁺ ?	¹⁷⁰Ir	0+
¹⁷¹Pt	78	93	170.981249(87)	45.5(25) ms	α (86%)	¹⁶⁷Os	7/2−
¹⁷¹Pt	78	93	170.981249(87)	45.5(25) ms	β⁺ (14%)	¹⁷¹Ir	7/2−
^171mPt	412.6(10) keV			901(9) ns	IT	¹⁷¹Pt	13/2+
¹⁷²Pt	78	94	171.977341(11)	97.6(13) ms	α (96%)	¹⁶⁸Os	0+
¹⁷²Pt	78	94	171.977341(11)	97.6(13) ms	β⁺ (4%)	¹⁷²Ir	0+
¹⁷³Pt	78	95	172.976450(68)	382(2) ms	α (86%)	¹⁶⁹Os	(5/2−)
¹⁷³Pt	78	95	172.976450(68)	382(2) ms	β⁺ (14%)	¹⁷³Ir	(5/2−)
¹⁷⁴Pt	78	96	173.972820(11)	862(8) ms	α (74.9%)	¹⁷⁰Os	0+
¹⁷⁴Pt	78	96	173.972820(11)	862(8) ms	β⁺ (25.1%)	¹⁷⁴Ir	0+
¹⁷⁵Pt	78	97	174.972401(20)	2.43(4) s	α (64%)	¹⁷¹Os	(7/2−)
¹⁷⁵Pt	78	97	174.972401(20)	2.43(4) s	β⁺ (36%)	¹⁷⁵Ir	(7/2−)
¹⁷⁶Pt	78	98	175.968938(14)	6.33(15) s	β⁺ (60%)	¹⁷⁶Ir	0+
¹⁷⁶Pt	78	98	175.968938(14)	6.33(15) s	α (40%)	¹⁷²Os	0+
¹⁷⁷Pt	78	99	176.968470(16)	10.0(04) s	β⁺ (94.3%)	¹⁷⁷Ir	5/2−
¹⁷⁷Pt	78	99	176.968470(16)	10.0(04) s	α (5.7%)	¹⁷³Os	5/2−
^177mPt	147.5(4) keV			2.35(4) μs	IT	¹⁷⁷Pt	1/2−
¹⁷⁸Pt	78	100	177.965649(11)	20.7(7) s	β⁺ (92.3%)	¹⁷⁸Ir	0+
¹⁷⁸Pt	78	100	177.965649(11)	20.7(7) s	α (7.7%)	¹⁷⁴Os	0+
¹⁷⁹Pt	78	101	178.9653588(86)	21.2(4) s	β⁺ (99.76%)	¹⁷⁹Ir	1/2−
¹⁷⁹Pt	78	101	178.9653588(86)	21.2(4) s	α (0.24%)	¹⁷⁵Os	1/2−
¹⁸⁰Pt	78	102	179.963038(11)	56(3) s	β⁺ (99.48%)	¹⁸⁰Ir	0+
¹⁸⁰Pt	78	102	179.963038(11)	56(3) s	α (0.52%)	¹⁷⁶Os	0+
¹⁸¹Pt	78	103	180.963090(15)	52.0(22) s	β⁺ (99.93%)	¹⁸¹Ir	1/2−
¹⁸¹Pt	78	103	180.963090(15)	52.0(22) s	α (0.074%)	¹⁷⁷Os	1/2−
^181mPt	116.65(8) keV			>300 ns	IT	¹⁸¹Pt	7/2−
¹⁸²Pt	78	104	181.961172(14)	2.67(12) min	β⁺ (99.962%)	¹⁸²Ir	0+
¹⁸²Pt	78	104	181.961172(14)	2.67(12) min	α (0.038%)	¹⁷⁸Os	0+
¹⁸³Pt	78	105	182.961596(15)	6.5(10) min	β⁺ (99.99%)	¹⁸³Ir	1/2−
¹⁸³Pt	78	105	182.961596(15)	6.5(10) min	α (0.0096%)	¹⁷⁹Os	1/2−
^183m1Pt	34.74(7) keV			43(5) s	β⁺ (96.9%)	¹⁸³Ir	7/2−
					IT (3.1%)	¹⁸³Pt
					α ?	¹⁷⁹Os
^183m2Pt	195.90(10) keV			>150 ns	IT	¹⁸³Pt	9/2+
¹⁸⁴Pt	78	106	183.959922(16)	17.3(2) min	β⁺	¹⁸⁴Ir	0+
¹⁸⁴Pt	78	106	183.959922(16)	17.3(2) min	α (0.0017%)	¹⁸⁰Os	0+
^184mPt	1840.3(8) keV			1.01(5) ms	IT	¹⁸⁴Pt	8−
¹⁸⁵Pt	78	107	184.960614(28)	70.9(24) min	β⁺	¹⁸⁵Ir	9/2+
¹⁸⁵Pt	78	107	184.960614(28)	70.9(24) min	α (0.0050%)	¹⁸¹Os	9/2+
^185m1Pt	103.41(5) keV			33.0(8) min	β⁺	¹⁸⁵Ir	1/2−
^185m2Pt	200.89(4) keV			728(20) ns	IT	¹⁸⁵Pt	5/2−
¹⁸⁶Pt	78	108	185.959351(23)	2.08(5) h	β⁺	¹⁸⁶Ir	0+
¹⁸⁶Pt	78	108	185.959351(23)	2.08(5) h	α (1.4×10⁻⁴%)	¹⁸²Os	0+
¹⁸⁷Pt	78	109	186.960617(26)	2.35(3) h	β⁺	¹⁸⁷Ir	3/2−
^187mPt	174.38(22) keV			311(15) μs	IT	¹⁸⁷Pt	11/2+
¹⁸⁸Pt	78	110	187.9593975(57)	10.16(18) d	EC	¹⁸⁸Ir	0+
¹⁸⁸Pt	78	110	187.9593975(57)	10.16(18) d	α (2.6×10⁻⁵%)	¹⁸⁴Os	0+
¹⁸⁹Pt	78	111	188.960848(11)	10.87(12) h	β⁺	¹⁸⁹Ir	3/2−
^189m1Pt	172.79(6) keV			464(25) ns	IT	¹⁸⁹Pt	9/2−
^189m2Pt	191.6(4) keV			143(5) μs	IT	¹⁸⁹Pt	(13/2+)
¹⁹⁰Pt	78	112	189.95994982(71)	4.83(3)×10¹¹ y	α^{[n 10]}	¹⁸⁶Os	0+	1.2(2)×10⁻⁴
¹⁹¹Pt	78	113	190.9616763(44)	2.83(2) d	EC	¹⁹¹Ir	3/2−
^191m1Pt	100.663(20) keV			>1 μs	IT	¹⁹¹Pt	9/2−
^191m2Pt	149.035(22) keV			95(5) μs	IT	¹⁹¹Pt	13/2+
¹⁹²Pt	78	114	191.9610427(28)	Observationally Stable^{[n 11]}			0+	0.00782(24)
^192mPt	2172.37(13) keV			272(23) ns	IT	¹⁹²Pt	10−
¹⁹³Pt	78	115	192.9629845(15)	50(6) y	EC	¹⁹³Ir	1/2−
^193mPt	149.78(4) keV			4.33(3) d	IT	¹⁹³Pt	13/2+
¹⁹⁴Pt	78	116	193.96268350(53)	Observationally Stable^{[n 12]}			0+	0.3286(41)
¹⁹⁵Pt	78	117	194.96479433(54)	Observationally Stable^{[n 13]}			1/2−	0.3378(24)
^195mPt	259.077(23) keV			4.010(5) d	IT	¹⁹⁵Pt	13/2+
¹⁹⁶Pt	78	118	195.96495465(55)	Observationally Stable^{[n 14]}			0+	0.2521(34)
¹⁹⁷Pt	78	119	196.96734303(58)	19.8915(19) h	β⁻	¹⁹⁷Au	1/2−
^197mPt	399.59(20) keV			95.41(18) min	IT (96.7%)	¹⁹⁷Pt	13/2+
^197mPt	399.59(20) keV			95.41(18) min	β⁻ (3.3%)	¹⁹⁷Au	13/2+
¹⁹⁸Pt	78	120	197.9678967(23)	Observationally Stable^{[n 15]}			0+	0.0734(13)
¹⁹⁹Pt	78	121	198.9705970(23)	30.80(21) min	β⁻	¹⁹⁹Au	5/2−
^199mPt	424(2) keV			13.48(16) s	IT	¹⁹⁹Pt	13/2+
²⁰⁰Pt	78	122	199.971445(22)	12.6(3) h	β⁻	²⁰⁰Au	0+
²⁰¹Pt	78	123	200.974513(54)	2.5(1) min	β⁻	²⁰¹Au	(5/2−)
²⁰²Pt	78	124	201.975639(27)	44(15) h	β⁻	²⁰²Au	0+
^202mPt	1788.5(4) keV			141(7) μs	IT	²⁰²Pt	(7−)
²⁰³Pt	78	125	202.97906(22)#	22(4) s	β⁻	²⁰³Au	(1/2−)
^203m1Pt	1367(3)# keV			12(5) s	β⁻	²⁰³Au	13/2+#
^203m1Pt	1367(3)# keV			12(5) s	IT ?	²⁰³Pt	13/2+#
^203m2Pt	1420(50)# keV			>100# ns	IT	²⁰³Pt	27/2−#
^203m3Pt	2530(50)# keV			641(55) ns	IT	²⁰³Pt	33/2+#
²⁰⁴Pt	78	126	203.98108(22)#	10.3(14) s	β⁻	²⁰⁴Au	0+
^204m1Pt	1995.1(07) keV			5.5(7) μs	IT	²⁰⁴Pt	(5−)
^204m2Pt	2035(23) keV			55(3) μs	IT	²⁰⁴Pt	(7−)
^204m3Pt	3193(23) keV			146(14) ns	IT	²⁰⁴Pt	(10+)
²⁰⁵Pt	78	127	204.98624(32)#	2# s	β⁻ ?	²⁰⁵Au	9/2+#
²⁰⁶Pt	78	128	205.99008(32)#	500# ms	β⁻ ?	²⁰⁶Au	0+
²⁰⁶Pt	78	128	205.99008(32)#	500# ms	β⁻n ?	²⁰⁵Au	0+
²⁰⁷Pt	78	129	206.99556(43)#	600# ms	β⁻ ?	²⁰⁷Au	9/2+#
²⁰⁷Pt	78	129	206.99556(43)#	600# ms	β⁻n ?	²⁰⁶Au	9/2+#
²⁰⁸Pt	78	130	207.99946(43)#	220# ms	β⁻ ?	²⁰⁸Au	0+
²⁰⁸Pt	78	130	207.99946(43)#	220# ms	β⁻n ?	²⁰⁷Au	0+
This table header & footer: view

[n 1]
^mPt – Excited nuclear isomer.
[n 2]
( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
[n 3]
# – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
[n 4]
Bold half-life – nearly stable, half-life longer than age of universe.
[n 5]
Modes of decay:

EC: Electron capture

IT: Isomeric transition
[n 6]
Bold italics symbol as daughter – Daughter product is nearly stable.
[n 7]
Bold symbol as daughter – Daughter product is stable.
[n 8]
( ) spin value – Indicates spin with weak assignment arguments.
[n 9]
# – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
[N 10]
Theorized to also undergo β⁺β⁺ decay to ¹⁹⁰Os
[N 11]
Believed to undergo α decay to ¹⁸⁸Os with a half-life over 6.0×10¹⁶ years
[N 12]
Believed to undergo α decay to ¹⁹⁰Os
[N 13]
Believed to undergo α decay to ¹⁹¹Os with a half-life over 6.3×10¹⁸ years
[N 14]
Believed to undergo α decay to ¹⁹²Os
[N 15]
Believed to undergo α decay to ¹⁹⁴Os or double β⁻ decay to ¹⁹⁸Hg with a half-life over 3.20×10¹⁴ years

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This article uses material from the Wikipedia article Platinum-185, and is written by contributors. Text is available under a CC BY-SA 4.0 International License; additional terms may apply. Images, videos and audio are available under their respective licenses.

[4] [n 1]
^mPt – Excited nuclear isomer.

[6] [n 2]
( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.

[TMS-7] [n 3]
# – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).

[8] [n 4]
Bold half-life – nearly stable, half-life longer than age of universe.

[9] [n 5]
Modes of decay:

EC: Electron capture

IT: Isomeric transition

[10] [n 6]
Bold italics symbol as daughter – Daughter product is nearly stable.

[11] [n 7]
Bold symbol as daughter – Daughter product is stable.

[12] [n 8]
( ) spin value – Indicates spin with weak assignment arguments.

[TNN-13] [n 9]
# – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).

[14] [N 10]
Theorized to also undergo β⁺β⁺ decay to ¹⁹⁰Os

[15] [N 11]
Believed to undergo α decay to ¹⁸⁸Os with a half-life over 6.0×10¹⁶ years

[16] [N 12]
Believed to undergo α decay to ¹⁹⁰Os

[17] [N 13]
Believed to undergo α decay to ¹⁹¹Os with a half-life over 6.3×10¹⁸ years

[18] [N 14]
Believed to undergo α decay to ¹⁹²Os

[19] [N 15]
Believed to undergo α decay to ¹⁹⁴Os or double β⁻ decay to ¹⁹⁸Hg with a half-life over 3.20×10¹⁴ years

[NUBASE2020-1] [1]
Kondev, 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.

[2] [2]
"Standard Atomic Weights: Platinum". CIAAW. 2005.

[CIAAW2021-3] [3]
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.

[AME2020_II-5] [4]
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.

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Platinum-185

List of isotopes

References

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