Природно настанатиот скандиум (21 Sc) е составен од еден стабилен изотоп, 45Sc. Карактеризирани се 27 радиоизотопи, од кои најстабилни се 46 Sc со полураспад од 83,8 дена, 47Sc со полураспад од 3,35 дена и 48Sc со полураспад од 43,7 часа и 44Sc со полураспад од 39 часа. Сите преостанати изотопи имаат полураспад кој е помал од четири часа, а повеќето од нив имаат полураспад помал од две минути, а најмалку стабилен е неврзаниот протон 39Sc со полураспад пократок од 300 наносекунди. Овој елемент има и 13 мета состојби а анјстабилен е најстабилна 44m2Sc (t1/2 58,6 ж).
Изотопите на скандиум се движат од 37Sc до 62Sc. Примарниот режим на распаѓање на маси пониски од единствениот стабилен изотоп, 45Sc, е бета-плус или електронски распад, а примарниот режим на маси над него е бета-минус. Примарните распадни производи при атомска тежина под 45Sc се изотопи на калциумот и примарни производи од поголема атомска тежина се изотопи на титанот.
Список на изотопи
|-id=Scandium-37 | 37Sc | style="text-align:right" | 21 | style="text-align:right" | 16 | 37.00376(44) | | p | 36Ca
|-id=Scandium-38 | 38Sc | style="text-align:right" | 21 | style="text-align:right" | 17 | 37.995002(15) | | p | 37Ca
|-id=Scandium-39 | 39Sc | style="text-align:right" | 21 | style="text-align:right" | 18 | 38.984785(26) | | p | 38Ca | 7/2−# | |-id=Scandium-40 | rowspan=3|40Sc | rowspan=3 style="text-align:right" | 21 | rowspan=3 style="text-align:right" | 19 | rowspan=3|39.9779673(30) | rowspan=3|182.3(7) ms | β+ (99.54%) | 40Ca | rowspan=3|4− | rowspan=3| |- | β+, p (0.44%) | 39K |- | β+, α (0.017%) | 36Ar |-id=Scandium-41 | 41Sc | style="text-align:right" | 21 | style="text-align:right" | 20 | 40.969251163(83) | 596.3(17) ms | β+ | 41Ca | 7/2− | |-id=Scandium-42 | 42Sc | style="text-align:right" | 21 | style="text-align:right" | 21 | 41.96551669(17) | 680.72(26) ms | β+ | 42Ca | 0+ | |-id=Scandium-42m | style="text-indent:1em" | 42mSc | colspan="3" style="text-indent:2em" | 616.81(6) keV | 61.7(4) s | β+ | 42Ca | 7+ | |-id=Scandium-43 | 43Sc | style="text-align:right" | 21 | style="text-align:right" | 22 | 42.9611504(20) | 3.891(12) h | β+ | 43Ca | 7/2− | |-id=Scandium-43m1 | style="text-indent:1em" | 43m1Sc | colspan="3" style="text-indent:2em" | 151.79(8) keV | 438(5) μs | ИП | 43Sc | 3/2+ | |-id=Scandium-43m2 | style="text-indent:1em" | 43m2Sc | colspan="3" style="text-indent:2em" | 3123.73(15) keV | 472(3) ns | ИП | 43Sc | 19/2−
| 44Sc | style="text-align:right" | 21 | style="text-align:right" | 23 | 43.9594028(19) | 4.0421(25) h | β+ | 44Ca | 2+ | |-id=Scandium-44m1 | style="text-indent:1em" | 44m1Sc | colspan="3" style="text-indent:2em" | 67.8679(14) keV | 154.8(8) ns | IT | 44Sc | 1− | |-id=Scandium-44m2 | style="text-indent:1em" | 44m2Sc | colspan="3" style="text-indent:2em" | 146.1914(20) keV | 51.0(3) μs | IT | 44Sc | 0− | |-id=Scandium-44m3 | rowspan=2 style="text-indent:1em" | 44m3Sc | rowspan=2 colspan="3" style="text-indent:2em" | 271.240(10) keV | rowspan=2|58.61(10) h | ИП (98.80%) | 44Sc | rowspan=2| 6+ | rowspan=2| |- | β+ (1.20%) | 44Ca |-id=Scandium-45 | 45Sc | style="text-align:right" | 21 | style="text-align:right" | 24 | 44.95590705(71) | colspan=3 align=center|Стабилен | 7/2− | 1.0000 |-id=Scandium-45m | style="text-indent:1em" | 45mSc | colspan="3" style="text-indent:2em" | 12.40(5) keV | 318(7) ms | ИП | 45Sc | 3/2+ | |-id=Scandium-46 | 46Sc | style="text-align:right" | 21 | style="text-align:right" | 25 | 45.95516703(72) | 83.757(14) d | β− | 46Ti | 4+ | |-id=Scandium-46m1 | style="text-indent:1em" | 46m1Sc | colspan="3" style="text-indent:2em" | 52.011(1) keV | 9.4(8) μs | IT | 46Sc | 6+ | |-id=Scandium-46m2 | style="text-indent:1em" | 46m2Sc | colspan="3" style="text-indent:2em" | 142.528(7) keV | 18.75(4) s | ИП | 46Sc | 1− | |-id=Scandium-47 | 47Sc | style="text-align:right" | 21 | style="text-align:right" | 26 | 46.9524024(21) | 3.3492(6) d | β− | 47Ti | 7/2− | |-id=Scandium-47m | style="text-indent:1em" | 47mSc | colspan="3" style="text-indent:2em" | 766.83(9) keV | 272(8) ns | ИП | 47Sc | (3/2)+ | |-id=Scandium-48 | 48Sc | style="text-align:right" | 21 | style="text-align:right" | 27 | 47.9522229(53) | 43.67(9) h | β− | 48Ti | 6+ | |-id=Scandium-49 | 49Sc | style="text-align:right" | 21 | style="text-align:right" | 28 | 48.9500132(24) | 57.18(13) min | β− | 49Ti | 7/2− | |-id=Scandium-50 | 50Sc | style="text-align:right" | 21 | style="text-align:right" | 29 | 49.9521874(27) | 102.5(5) s | β− | 50Ti | 5+ | |-id=Scandium-50m | rowspan=2 style="text-indent:1em" | 50mSc | rowspan=2 colspan="3" style="text-indent:2em" | 256.895(10) keV | rowspan=2|350(40) ms | ИП (>99%) | 50Sc | rowspan=2|2+ | rowspan=2| |- | β− (<1%) | 50Ti |-id=Scandium-51 | rowspan=2|51Sc | rowspan=2 style="text-align:right" | 21 | rowspan=2 style="text-align:right" | 30 | rowspan=2|50.9535688(27) | rowspan=2|12.4(1) s | β− | 51Ti | rowspan=2|(7/2)− | rowspan=2| |- | β−, n? | 50Ti |-id=Scandium-52 | rowspan=2|52Sc | rowspan=2 style="text-align:right" | 21 | rowspan=2 style="text-align:right" | 31 | rowspan=2|51.9564962(33) | rowspan=2|8.2(2) s | β− | 52Ti | rowspan=2|3(+) | rowspan=2| |- | β−, n? | 51Ti |-id=Scandium-53 | rowspan=2|53Sc | rowspan=2 style="text-align:right" | 21 | rowspan=2 style="text-align:right" | 32 | rowspan=2|52.958379(19) | rowspan=2|2.4(6) s | β− | 53Ti | rowspan=2|(7/2−) | rowspan=2| |- | β−, n? | 52Ti |-id=Scandium-54 | rowspan=2|54Sc | rowspan=2 style="text-align:right" | 21 | rowspan=2 style="text-align:right" | 33 | rowspan=2|53.963029(15) | rowspan=2|526(15) ms | β− (84%) | 54Ti | rowspan=2|(3)+ | rowspan=2| |- | β−, n (16%) | 53Ti |-id=Scandium-54m | style="text-indent:1em" | 54mSc | colspan="3" style="text-indent:2em" | 110.5(3) keV | 2.77(2) μs | ИП | 54Sc | (5+,4+) | |-id=Scandium-55 | rowspan=3|55Sc | rowspan=3 style="text-align:right" | 21 | rowspan=3 style="text-align:right" | 34 | rowspan=3|54.966890(67) | rowspan=3|96(2) ms | β− (83%) | 55Ti | rowspan=3|(7/2)− | rowspan=3| |- | β−, n (17%) | 54Ti |- | β−, 2n? | 53Ti |-id=Scandium-56 | rowspan=3|56Sc | rowspan=3 style="text-align:right" | 21 | rowspan=3 style="text-align:right" | 35 | rowspan=3|55.97261(28) | rowspan=3|26(6) ms | β− | 56Ti | rowspan=3|(1+) | rowspan=3| |- | β−, n? | 55Ti |- | β−, 2n? | 54Ti |-id=Scandium-56m1 | rowspan=3 style="text-indent:1em" | 56m1ScРедоследот на основната состојба и изомерот е непознат. | rowspan=3 colspan="3" style="text-indent:2em" | 0(100)# keV | rowspan=3|75(6) ms | β− (<88%) | 56Ti | rowspan=3|(6+,5+) | rowspan=3| |- | β−, n (>12%) | 55Ti |- | β−, 2n? | 54Ti |-id=Scandium-56m2 | style="text-indent:1em" | 56m2Sc | colspan="3" style="text-indent:2em" | 775.0(1) keV | 290(17) ns | ИП | 56Sc | (4+) | |-id=Scandium-57 | rowspan=3|57Sc | rowspan=3 style="text-align:right" | 21 | rowspan=3 style="text-align:right" | 36 | rowspan=3|56.97705(19) | rowspan=3|22(2) ms | β− | 57Ti | rowspan=3|7/2−# | rowspan=3| |- | β−, n? | 56Ti |- | β−, 2n? | 55Ti |-id=Scandium-58 | rowspan=3|58Sc | rowspan=3 style="text-align:right" | 21 | rowspan=3 style="text-align:right" | 37 | rowspan=3|57.98338(20) | rowspan=3|12(5) ms | β− | 58Ti | rowspan=3|3+# | rowspan=3| |- | β−, n? | 57Ti |- | β−, 2n? | 56Ti |-id=Scandium-58m | style="text-indent:1em" | 58mSc | colspan="3" style="text-indent:2em" | 1420.7(22) keV | 0.60(13) μs | ИП | 58Sc
|-id=Scandium-59 | rowspan=3|59Sc | rowspan=3 style="text-align:right" | 21 | rowspan=3 style="text-align:right" | 38 | rowspan=3|58.98837(27) | rowspan=3|12# ms[>620 ns] | β−? | 59Ti | rowspan=3|7/2−# | rowspan=3| |- | β−, n? | 58Ti |- | β−, 2n? | 57Ti |-id=Scandium-60 | rowspan=3|60Sc | rowspan=3 style="text-align:right" | 21 | rowspan=3 style="text-align:right" | 39 | rowspan=3|59.99512(54)# | rowspan=3|10# ms[>620 ns] | β− | 60Ti? | rowspan=3|3+# | rowspan=3| |- | β−, n? | 59Ti |- | β−, 2n? | 58Ti |-id=Scandium-61 | rowspan=3|61Sc | rowspan=3 style="text-align:right" | 21 | rowspan=3 style="text-align:right" | 40 | rowspan=3|61.00054(64)# | rowspan=3|7# ms[>620 ns] | β−? | 61Ti | rowspan=3|7/2-# | rowspan=3| |- | β−, n? | 60Ti |- | β−, 2n? | 59Ti |-id=Scandium-62 | rowspan=3|62Sc | rowspan=3 style="text-align:right" | 21 | rowspan=3 style="text-align:right" | 41 | rowspan=3|62.00785(64)# | rowspan=3|2# ms[>400 ns] | β−? | 62Ti | rowspan=3| | rowspan=3| |- | β−, n? | 61Ti |- | β−, 2n? | 60Ti
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