Isotopes of mendelevium

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Template:Short description Template:Infobox mendelevium isotopes Mendelevium (101Md) is a synthetic element, and thus a standard atomic weight cannot be given. Like all artificial elements, it has no stable isotopes. The first isotope to be synthesized was 256Md (which was also the first isotope of any element produced one atom at a time) in 1955. There are 17 known radioisotopes, ranging in atomic mass from 244Md to 260Md, and 10 isomers. The longest-lived isotope is 258Md with a half-life of 51.3 days, and the longest-lived isomer is 258mMd with a half-life of 57 minutes.

List of isotopes

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Template:Isotopes table |-id=Mendelevium-244 | rowspan=2|244MdTemplate:Refn | rowspan=2 style="text-align:right" | 101 | rowspan=2 style="text-align:right" | 143 | rowspan=2|244.08116(40)# | rowspan=2|Script error: No such module "val".
[Script error: No such module "val".] | α | 240Es | rowspan=2|3+# |- | β+, SF (<14%) | (various) |-id=Mendelevium-244m | style="text-indent:1em" | 244mMd[n 1] | colspan="3" style="text-indent:2em" | 200(150)# keV | ~9 μs | IT | 244Md | 7+# |-id=Mendelevium-245 | 245Md | style="text-align:right" | 101 | style="text-align:right" | 144 | 245.08086(28)# | 0.38(10) s | α | 241Es | (7/2−) |-id=Mendelevium-245m | style="text-indent:1em" | 245mMd[n 2] | colspan="3" style="text-indent:2em" | 100(100)# keV | 0.90(25) ms | SF | (various) | 1/2−# |-id=Mendelevium-246 | 246Md | style="text-align:right" | 101 | style="text-align:right" | 145 | 246.08171(28)# | 0.92(18) s | α | 242Es | 1−# |-id=Mendelevium-246m | rowspan=3 style="text-indent:1em" | 246mMd[n 2] | rowspan=3 colspan="3" style="text-indent:2em" | 60(60) keV | rowspan=3|Script error: No such module "val". | β+ (~67%) | 246Fm | rowspan=3|4−# |- | α (<23%) | 242Es |- | β+, SF (>10%) | (various) |-id=Mendelevium-247 | rowspan=2|247Md | rowspan=2 style="text-align:right" | 101 | rowspan=2 style="text-align:right" | 146 | rowspan=2|247.08152(22)# | rowspan=2|Script error: No such module "val".[1] | α (99.14%) | 243Es | rowspan=2|(7/2−) |- | SF (0.86%)[1] | (various) |-id=Mendelevium-247m | rowspan=2 style="text-indent:1em" | 247mMd[1] | rowspan=2 colspan="3" style="text-indent:2em" | 153 keV | rowspan=2|Script error: No such module "val". | α (80%) | 243Es | rowspan=2|(1/2−) |- | SF (20%) | (various) |-id=Mendelevium-248 | rowspan=3|248Md | rowspan=3 style="text-align:right" | 101 | rowspan=3 style="text-align:right" | 147 | rowspan=3|248.08261(20)# | rowspan=3|Script error: No such module "val". | β+ (80%) | 248Fm | rowspan=3| |- | α (20%) | 244Es |- | β+, SF (<0.05%) | (various) |-id=Mendelevium-249 | rowspan=2|249Md | rowspan=2 style="text-align:right" | 101 | rowspan=2 style="text-align:right" | 148 | rowspan=2|249.08286(18) | rowspan=2|Script error: No such module "val". | α (75%) | 245Es | rowspan=2|(7/2−) |- | β+ (25%) | 249Fm |-id=Mendelevium-249m | style="text-indent:1em" | 249mMd[n 2] | colspan="3" style="text-indent:2em" | 100(100)# keV | Script error: No such module "val".
[Script error: No such module "val".] | α | 245Es | (1/2−) |-id=Mendelevium-250 | rowspan=3|250Md | rowspan=3 style="text-align:right" | 101 | rowspan=3 style="text-align:right" | 149 | rowspan=3|250.084165(98) | rowspan=3|54(4) s | β+ (93.0%) | 250Fm | rowspan=3|2−# |- | α (7.0%) | 246Es |- | β+, SF (0.026%) | (various) |-id=Mendelevium-250m | style="text-indent:1em" | 250mMd | colspan="3" style="text-indent:2em" | 120(40) keV | 42.4(45) s | α | 246Es | 7+# |-id=Mendelevium-251 | rowspan=2|251Md | rowspan=2 style="text-align:right" | 101 | rowspan=2 style="text-align:right" | 150 | rowspan=2|251.084774(20) | rowspan=2|Script error: No such module "val". | β+ (90%) | 251Fm | rowspan=2|(7/2−) |- | α (10%) | 247Es |-id=Mendelevium-251m | style="text-indent:1em" | 251mMd | colspan="3" style="text-indent:2em" | 53(8) keV | 20# s | | | (1/2−) |-id=Mendelevium-252 | 252Md | style="text-align:right" | 101 | style="text-align:right" | 151 | 252.086385(98) | Script error: No such module "val". | β+ | 252Fm | 1+# |- | rowspan=2|253Md | rowspan=2 style="text-align:right" | 101 | rowspan=2 style="text-align:right" | 152 | rowspan=2|253.087143(34)# | rowspan=2|Script error: No such module "val".
[Script error: No such module "val".] | β+ (~99.3%) | 253Fm | rowspan=2|(7/2−) |- | α (~0.7%) | 249Es |-id=Mendelevium-253m | style="text-indent:1em" | 253mMd | colspan="3" style="text-indent:2em" | 60(30) keV | 1# min | | | 1/2−# |-id=Mendelevium-254 | 254Md | style="text-align:right" | 101 | style="text-align:right" | 153 | 254.08959(11)# | Script error: No such module "val". | β+ | 254Fm | 0−# |-id=Mendelevium-254m | style="text-indent:1em" | 254mMd[n 2] | colspan="3" style="text-indent:2em" | 50(100)# keV | Script error: No such module "val". | β+ | 254Fm | 3−# |-id=Mendelevium-255 | rowspan=2|255Md | rowspan=2 style="text-align:right" | 101 | rowspan=2 style="text-align:right" | 154 | rowspan=2|255.0910817(60) | rowspan=2|Script error: No such module "val". | β+ (93%) | 255Fm | rowspan=2|7/2− |- | α (7%) | 251Es |-id=Mendelevium-256 | rowspan=3|256Md | rowspan=3 style="text-align:right" | 101 | rowspan=3 style="text-align:right" | 155 | rowspan=3|256.09389(13)# | rowspan=3|Script error: No such module "val". | β+ (90.8%) | 256Fm | rowspan=3|(1−) |- | α (9.2%) | 252Es |- | SF (<3%) | (various) |-id=Mendelevium-257 | rowspan=2|257Md | rowspan=2 style="text-align:right" | 101 | rowspan=2 style="text-align:right" | 156 | rowspan=2|257.0955373(17) | rowspan=2|Script error: No such module "val". | EC (85%) | 257Fm | rowspan=2|(7/2−) |- | α (15%) | 253Es |-id=Mendelevium-258 | rowspan=3|258Md | rowspan=3 style="text-align:right" | 101 | rowspan=3 style="text-align:right" | 157 | rowspan=3|258.0984336(37) | rowspan=3|Script error: No such module "val". | α | 254Es | rowspan=3|8−# |- | β− (<0.0015%) | 258No |- | β+ (<0.0015%) | 258Fm |-id=Mendelevium-258m | rowspan=3 style="text-indent:1em" | 258mMd[n 2] | rowspan=3 colspan="3" style="text-indent:2em" | 0(200)# keV | rowspan=3|Script error: No such module "val". | EC (85%) | 258Fm | rowspan=3|1−# |- | SF (<15%) | (various) |- | α (<1.2%) | 254Es |-id=Mendelevium-259 | 259Md[n 3] | style="text-align:right" | 101 | style="text-align:right" | 158 | 259.10045(11)# | Script error: No such module "val". | SF | (various) | 7/2−# |- | rowspan=4|260Md | rowspan=4 style="text-align:right" | 101 | rowspan=4 style="text-align:right" | 159 | rowspan=4|260.10365(34)# | rowspan=4|Script error: No such module "val". | SF | (various) | rowspan=4| |- | α (<5%) | 256Es |- | EC (<5%) | 260Fm |- | β− (<3.5%) | 260No Template:Isotopes table/footer

Chronology of isotope discovery

Isotope Discovered Reaction
244Md 2020 209Bi(40Ar,5n)
245Md 1996 209Bi(40Ar,4n)
246Md 1996 209Bi(40Ar,3n)
247Md 1981 209Bi(40Ar,2n)
248Md 1973 241Am(12C,5n)
249Md 1973 241Am(12C,4n)
250Md 1973 243Am(12C,5n), 243Am(13C,6n)
251Md 1973 243Am(12C,4n), 243Am(13C,5n)
252Md 1973 243Am(13C,4n)
253Md 1992 243Am(13C,3n)
254Md 1970 253Es(α,3n)
255Md 1958 253Es(α,2n)
256Md 1955 253Es(α,n)
257Md 1964 252Cf(11B,α2n)
258Md 1970 255Es(α,n)
259Md 1982 248Cm(18O,α3n)[2]
260Md 1989 254Es+18O, 22Ne — transfer

References

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  1. ↑ a b c Script error: No such module "Citation/CS1".
  2. ↑ see nobelium

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