Isotopes of lawrencium
List of isotopes
Abbreviations: SF: Spontaneous fission Not directly synthesized, occurs as a decay product of ²⁵⁶Db Not directly synthesized, occurs as a decay product of ²⁵⁷Db Not directly synthesized, occurs as a decay product of ²⁵⁸Db Not directly synthesized, occurs as a decay product of ²⁹⁴Ts

Isotopes of lawrencium

Section Title: List of isotopes
Table Section Text: Abbreviations: SF: Spontaneous fission Not directly synthesized, occurs as a decay product of ²⁵⁶Db Not directly synthesized, occurs as a decay product of ²⁵⁷Db Not directly synthesized, occurs as a decay product of ²⁵⁸Db Not directly synthesized, occurs as a decay product of ²⁹⁴Ts

nuclide symbol	Z(p)	N(n)	isotopic mass (u)	half-life	decay mode(s)	daughter isotope(s)	nuclear spin and parity

excitation energy

252Lr	103	149	252.09526(26)#	390(90) ms [0.36(+11−7) s]	α (90%)	248Md

β+ (10%)	252No

SF (1%)	(various)

253Lr	103	150	253.09509(22)#	580(70) ms [0.57(+7−6) s]	α (90%)	249Md	(7/2−)

SF (9%)	(various)

β+ (1%)	253No

253mLr	30(100)# keV	1.5(3) s [1.5(+3−2) s]	(1/2−)

254Lr	103	151	254.09648(32)#	13(3) s	α (78%)	250Md

β+ (22%)	254No

SF (.1%)	(various)

255Lr	103	152	255.096562(19)	22(4) s	α (69%)	251Md	7/2−#

β+ (30%)	255No

SF (1%)	(various)

256Lr	103	153	256.09849(9)	27(3) s	α (80%)	252Md

β+ (20%)	256No

SF (.01%)	(various)

257Lr	103	154	257.09942(5)#	646(25) ms	α (99.99%)	253Md	9/2+#

β+ (.01%)	257No

SF (.001%)	(various)

258Lr	103	155	258.10176(11)#	4.1(3) s	α (95%)	254Md

β+ (5%)	258No

259Lr	103	156	259.10290(8)#	6.2(3) s	α (77%)	255Md	9/2+#

SF (23%)	(various)

β+ (.5%)	259No

260Lr	103	157	260.10551(13)#	2.7 min	α (75%)	256Md

β+ (15%)	260No

SF (10%)	(various)

261Lr	103	158	261.10688(22)#	44 min	SF	(various)

α (rare)	257Md

262Lr	103	159	262.10961(22)#	216 min	β+	262No

α (rare)	258Md

266Lr	103	163	266.11983(56)#	11 h	SF	(various)

Sentence(s)

²⁵²Lr is the lightest isotope of lawrencium.

final_sentence: ²⁵²Lr is the lightest isotope of lawrencium.