User:Femto/elements e11

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• Obsolete, merged into articles
• page E1 — H He Li Be B C N O F Ne
• page E2 — Na Mg Al Si P S Cl Ar
• page E3 — K Ca Ga Ge As Se Br Kr
• page E4 — Sc Ti V Cr Mn Fe Co Ni Cu Zn
• page E5 — Rb Sr In Sn Sb Te I Xe
• page E6 — Y Zr Nb Mo Tc Ru Rh Pd Ag Cd
• page E7 — Cs Ba Tl Pb Bi Po At Rn
• page E8 — La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb
• page E9 — Lu Hf Ta W Re Os Ir Pt Au Hg
• page E10 — Fr Ra Lr Rf Db Sg Bh Hs Mt Ds Rg Uub Uut Uuq Uup Uuh
• page E11 — Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No

Contents 1 actinium 2 thorium 3 protactinium 4 uranium 5 neptunium 6 plutonium 7 americium 8 curium 9 berkelium 10 californium 11 einsteinium 12 fermium 13 mendelevium 14 nobelium

[edit] actinium

89 radium ← actinium → thorium La ↑ Ac ↓ (Ute) Periodic Table - Extended Periodic Table
General
Name, Symbol, Number	actinium, Ac, 89
Chemical series	actinides
Group, Period, Block	???, 7, f
Appearance	silvery
Atomic mass	(227) g/mol
Electron configuration	[Rn] 6d1 7s2
Electrons per shell	2, 8, 18, 32, 18, 9, 2
Physical properties
Phase	solid
Density (near r.t.)	10 g·cm−3
Melting point	(circa) 1323 K (1050 °C, 1922 °F)
Boiling point	3471 K (3198 °C, 5788 °F)
Heat of fusion	14 kJ·mol−1
Heat of vaporization	400 kJ·mol−1
Heat capacity	(25 °C) 27.2 J·mol−1·K−1
Atomic properties
Crystal structure	cubic face centered
Oxidation states	3 (neutral oxide)
Electronegativity	1.1 (Pauling scale)
Ionization energies	1st: 499 kJ/mol
	2nd: 1170 kJ/mol
Atomic radius	195 pm
Miscellaneous
Magnetic ordering	no data
Thermal conductivity	(300 K) 12 W·m−1·K−1
CAS registry number	7440-34-8
Selected isotopes
Main article: Isotopes of femto/elements e11 iso NA half-life DM DE (MeV) DP 225Ac syn 10 days α 5.935 221Fr 226Ac syn 29.37 hours β- 1.117 226Th 226Ac syn 29.37 hours ε 0.640 226Ra 226Ac syn 29.37 hours α 5.536 222Fr 227Ac 100% 21.773 years β- 0.045 227Th 227Ac 100% 21.773 years α 5.042 223Fr
References

[edit] thorium

90 actinium ← thorium → protactinium Ce ↑ Th ↓ (Uqn) Periodic Table - Extended Periodic Table
General
Name, Symbol, Number	thorium, Th, 90
Chemical series	transition metals
Group, Period, Block	???, 7, f
Appearance	silvery white
Atomic mass	232.0381(1) g/mol
Electron configuration	[Rn] 6d2 7s2
Electrons per shell	2, 8, 18, 32, 18, 10, 2
Physical properties
Phase	solid
Density (near r.t.)	11.7 g·cm−3
Melting point	2115 K (1842 °C, 3348 °F)
Boiling point	5061 K (4788 °C, 8650 °F)
Heat of fusion	13.81 kJ·mol−1
Heat of vaporization	514 kJ·mol−1
Heat capacity	(25 °C) 26.230 J·mol−1·K−1
Vapor pressure P/Pa 1 10 100 1 k 10 k 100 k at T/K 2633 2907 3248 3683 4259 5055
Atomic properties
Crystal structure	cubic face centered
Oxidation states	4 (weakly basic oxide)
Electronegativity	1.3 (Pauling scale)
Ionization energies (more)	1st: 587 kJ·mol−1
	2nd: 1110 kJ·mol−1
	3rd: 1930 kJ·mol−1
Atomic radius	180 pm
Miscellaneous
Magnetic ordering	no data
Electrical resistivity	(0 °C) 147 nΩ·m
Thermal conductivity	(300 K) 54.0 W·m−1·K−1
Thermal expansion	(25 °C) 11.0 µm·m−1·K−1
Speed of sound (thin rod)	(20 °C) 2490 m/s
Young's modulus	79 GPa
Shear modulus	31 GPa
Bulk modulus	54 GPa
Poisson ratio	0.27
Mohs hardness	3.0
Vickers hardness	350 MPa
Brinell hardness	400 MPa
CAS registry number	7440-29-1
Selected isotopes
Main article: Isotopes of femto/elements e11 iso NA half-life DM DE (MeV) DP 228Th syn 1.9116 years α 5.520 224Ra 229Th syn 7340 years α 5.168 225Ra 230Th syn 75380 years α 4.770 226Ra 232Th 100% 1.405 E10 years α 4.083 228Ra
References

[edit] protactinium

91 thorium ← protactinium → uranium Pr ↑ Pa ↓ (Uqu) Periodic Table - Extended Periodic Table
General
Name, Symbol, Number	protactinium, Pa, 91
Chemical series	transition metals
Group, Period, Block	???, 7, f
Appearance	bright, silvery metallic luster
Atomic mass	231.03588(2) g/mol
Electron configuration	[Rn] 7s2 5f2 6d1
Electrons per shell	2, 8, 18, 32, 20, 9, 2
Physical properties
Phase	solid
Density (near r.t.)	15.37 g·cm−3
Melting point	1841 K (1568 °C, 2854 °F)
Boiling point	? 4300 K (? 4027 °C, ? °F)
Heat of fusion	12.34 kJ·mol−1
Heat of vaporization	481 kJ·mol−1
Heat capacity	(25 °C)  ??? J·mol−1·K−1
Atomic properties
Crystal structure	orthorhombic
Oxidation states	5 (weakly basic oxide)
Electronegativity	1.5 (Pauling scale)
Ionization energies	1st: 568 kJ/mol
Atomic radius	180 pm
Miscellaneous
Magnetic ordering	no data
Electrical resistivity	(0 °C) 177 nΩ·m
Thermal conductivity	(300 K) 47 W·m−1·K−1
CAS registry number	7440-13-3
Selected isotopes
Main article: Isotopes of femto/elements e11 iso NA half-life DM DE (MeV) DP 230Pa syn 17.4 d ε 1.310 230Th 230Pa syn 17.4 d β- 0.563 230U 231Pa syn 32760 a α 5.149 227Ac 233Pa syn 26.967 d β- 0.571 233U
References

[edit] uranium

92 protactinium ← uranium → neptunium Nd ↑ U ↓ (Uqb) Periodic Table - Extended Periodic Table
General
Name, Symbol, Number	uranium, U, 92
Chemical series	actinides
Group, Period, Block	???, 7, f
Appearance	silvery gray metallic
Atomic mass	238.02891(3) g/mol
Electron configuration	[Rn] 7s2 5f2 6d1
Electrons per shell	2, 8, 18, 32, 21, 9, 2
Physical properties
Phase	solid
Density (near r.t.)	19.1 g·cm−3
Liquid density at m.p.	17.3 g·cm−3
Melting point	1405.3 K (1132.2 °C, 2070 °F)
Boiling point	4404 K (4131 °C, 7468 °F)
Heat of fusion	9.14 kJ·mol−1
Heat of vaporization	417.1 kJ·mol−1
Heat capacity	(25 °C) 27.665 J·mol−1·K−1
Vapor pressure P/Pa 1 10 100 1 k 10 k 100 k at T/K 2325 2564 2859 3234 3727 4402
Atomic properties
Crystal structure	orthorhombic
Oxidation states	5 (weakly basic oxide)
Electronegativity	1.38 (Pauling scale)
Ionization energies	1st: 597.6 kJ/mol
	2nd: 1420 kJ/mol
Atomic radius	175 pm
Van der Waals radius	186 pm
Miscellaneous
Magnetic ordering	paramagnetic
Electrical resistivity	(0 °C) 0.280 µΩ·m
Thermal conductivity	(300 K) 27.5 W·m−1·K−1
Thermal expansion	(25 °C) 13.9 µm·m−1·K−1
Speed of sound (thin rod)	(20 °C) 3155 m/s
Young's modulus	208 GPa
Shear modulus	111 GPa
Bulk modulus	100 GPa
Poisson ratio	0.23
Mohs hardness	6.0
Vickers hardness	1960 MPa
Brinell hardness	2400 MPa
CAS registry number	7440-61-1
Selected isotopes
Main article: Isotopes of femto/elements e11 iso NA half-life DM DE (MeV) DP 232U syn 68.9 y α & SF 5.414 228Th 233U syn 159,200 y SF & α 4.909 229Th 234U 0.006% 245,500 y SF & α 4.859 230Th 235U 0.72% 7.038 E8 y SF & α 4.679 231Th 236U syn 2.342 E7 y SF & α 4.572 232Th 238U 99.275% 4.468 E9 y SF & α 4.270 234Th
References

[edit] neptunium

93 uranium ← neptunium → plutonium Pm ↑ Np ↓ (Uqt) Periodic Table - Extended Periodic Table
General
Name, Symbol, Number	neptunium, Np, 93
Chemical series	actinides
Group, Period, Block	???, 7, f
Appearance	silvery metallic
Atomic mass	(237) g/mol
Electron configuration	[Rn] 5f4 6d1 7s2
Electrons per shell	2, 8, 18, 32, 22, 9, 2
Physical properties
Phase	solid
Density (near r.t.)	20.2 g·cm−3
Melting point	910 K (637 °C, 1179 °F)
Boiling point	4273 K (4000 °C, 7232 °F)
Heat of fusion	3.20 kJ·mol−1
Heat of vaporization	336 kJ·mol−1
Heat capacity	(25 °C) 29.46 J·mol−1·K−1
Vapor pressure P/Pa 1 10 100 1 k 10 k 100 k at T/K 2194 2437
Atomic properties
Crystal structure	??? 3 forms: orthorhombic, tetragonal and cubic
Oxidation states	6, 5, 4, 3 (amphoteric oxide)
Electronegativity	1.36 (Pauling scale)
Ionization energies	1st: 604.5 kJ/mol
Atomic radius	175 pm
Miscellaneous
Magnetic ordering	???
Electrical resistivity	(22 °C) 1.220 µΩ·m
Thermal conductivity	(300 K) 6.3 W·m−1·K−1
CAS registry number	7439-99-8
Selected isotopes
Main article: Isotopes of femto/elements e11 iso NA half-life DM DE (MeV) DP 235Np syn 396.1 d α 5.192 231Pa 235Np syn 396.1 d ε 0.124 235U 236Np syn 154 E3 y ε 0.940 236U 236Np syn 154 E3 y β- 0.940 236Pu 236Np syn 154 E3 y α 5.020 232Pa 237Np syn 2.144 E6 y SF & α 4.959 233Pa
References

[edit] plutonium

94 neptunium ← plutonium → americium Sm ↑ Pu ↓ (Uqq) Periodic Table - Extended Periodic Table
General
Name, Symbol, Number	plutonium, Pu, 94
Chemical series	actinides
Group, Period, Block	???, 7, f
Appearance	silvery white
Atomic mass	(244) g/mol
Electron configuration	[Rn] 5f6 7s2
Electrons per shell	2, 8, 18, 32, 24, 8, 2
Physical properties
Phase	solid
Density (near r.t.)	19.816 g·cm−3
Liquid density at m.p.	16.63 g·cm−3
Melting point	912.5 K (639.4 °C, 1182.9 °F)
Boiling point	3501 K (3228 °C, 5842 °F)
Heat of fusion	2.82 kJ·mol−1
Heat of vaporization	333.5 kJ·mol−1
Heat capacity	(25 °C) 35.5 J·mol−1·K−1
Vapor pressure P/Pa 1 10 100 1 k 10 k 100 k at T/K 1756 1953 2198 2511 2926 3499
Atomic properties
Crystal structure	monoclinic
Oxidation states	6, 5, 4, 3 (amphoteric oxide)
Electronegativity	1.28 (Pauling scale)
Ionization energies	1st: 584.7 kJ/mol
Atomic radius	175 pm
Miscellaneous
Magnetic ordering	no data
Electrical resistivity	(0 °C) 1.460 µΩ·m
Thermal conductivity	(300 K) 6.74 W·m−1·K−1
Thermal expansion	(25 °C) 46.7 µm·m−1·K−1
Speed of sound (thin rod)	(20 °C) 2260 m/s
Young's modulus	96 GPa
Shear modulus	43 GPa
Poisson ratio	0.21
CAS registry number	7440-07-5
Selected isotopes
Main article: Isotopes of femto/elements e11 iso NA half-life DM DE (MeV) DP 238Pu syn 88 y SF  ? 234U 238Pu syn 88 y α 5.5 234U 239Pu trace 24.1 E3 y SF  ? 235U 239Pu trace 24.1 E3 y α 5.245 235U 240Pu syn 6.5 E3 y SF  ? 240Am 240Pu syn 6.5 E3 y β 0.005 240Am 242Pu syn 373 E3 y SF  ? 238U 242Pu syn 373 E3 y α 4.984 238U 244Pu syn 80.8 E6 y α 4.666 240U 244Pu syn 80.8 E6 y SF  ? 240U
References

[edit] americium

95 plutonium ← americium → curium Eu ↑ Am ↓ (Uqp) Periodic Table - Extended Periodic Table
General
Name, Symbol, Number	americium, Am, 95
Chemical series	actinides
Group, Period, Block	???, 7, f
Appearance	silvery white
Atomic mass	(243) g/mol
Electron configuration	[Rn] 5f7 7s2
Electrons per shell	2, 8, 18, 32, 25, 8, 2
Physical properties
Phase	solid
Density (near r.t.)	12 g·cm−3
Melting point	1449 K (1176 °C, 2149 °F)
Boiling point	2880 K (2607 °C, 4725 °F)
Heat of fusion	14.39 kJ·mol−1
Heat of vaporization	??? kJ·mol−1
Heat capacity	(25 °C) 62.7 J·mol−1·K−1
Vapor pressure P/Pa 1 10 100 1 k 10 k 100 k at T/K 1239 1356
Atomic properties
Crystal structure	hexagonal
Oxidation states	6, 5, 4, 3 (amphoteric oxide)
Electronegativity	1.3 (Pauling scale)
Ionization energies	1st: 578 kJ/mol
Atomic radius	175 pm
Miscellaneous
Magnetic ordering	no data
Thermal conductivity	(300 K) 10 W·m−1·K−1
CAS registry number	7440-35-9
Selected isotopes
Main article: Isotopes of femto/elements e11 iso NA half-life DM DE (MeV) DP 241Am syn 432.2 y SF  ? 237Np 241Am syn 432.2 y α 5.638 237Np 242mAm syn 141 y IT 0.049 238Np 242mAm syn 141 y α 5.637 238Np 242mAm syn 141 y SF  ? 238Np 243Am syn 7370 y SF  ? 239Np 243Am syn 7370 y α 5.438 239Np
References

[edit] curium

96 americium ← curium → berkelium Gd ↑ Cm ↓ (Uqh) Periodic Table - Extended Periodic Table
General
Name, Symbol, Number	curium, Cm, 96
Chemical series	actinides
Group, Period, Block	???, 7, f
Appearance	silvery
Atomic mass	(247) g/mol
Electron configuration	[Rn] 5f7 6d1 7s2
Electrons per shell	2, 8, 18, 32, 25, 9, 2
Physical properties
Phase	solid
Density (near r.t.)	13.51 g·cm−3
Melting point	1613 K (1340 °C, 2444 °F)
Boiling point	3383 K (3110 °C, 5630 °F)
Heat of fusion	??? 15 kJ·mol−1
Heat of vaporization	??? kJ·mol−1
Vapor pressure P/Pa 1 10 100 1 k 10 k 100 k at T/K 1788 1982
Atomic properties
Crystal structure	hexagonal close-packed
Oxidation states	3 (amphoteric oxide)
Electronegativity	1.3 (Pauling scale)
Ionization energies	1st: 581 kJ/mol
Miscellaneous
Magnetic ordering	no data
CAS registry number	7440-51-9
Selected isotopes
Main article: Isotopes of femto/elements e11 iso NA half-life DM DE (MeV) DP 242Cm syn 160 days SF  ? ?? 242Cm syn 160 days α 6.1 238Pu 243Cm syn 29.1 y α 6.169 239Pu 243Cm syn 29.1 y ε 0.009 Am 243Cm syn 29.1 y SF  ? ?? 244Cm syn 18.1 y SF  ? ?? 244Cm syn 18.1 y α 5.902 240Pu 245Cm syn 8500 y SF  ? ?? 245Cm syn 8500 y α 5.623 241Pu 246Cm syn 4730 y α 5.475 242Pu 246Cm syn 4730 y SF  ? ?? 247Cm syn 15.6 E6 y α 5.353 243Pu 248Cm syn 340 E3 y α 5.162 244Pu 248Cm syn 340 E3 y SF  ? ?? 250Cm syn 9000 y SF  ? ?? 250Cm syn 9000 y α 5.169 246Pu 250Cm syn 9000 y β- 0.037 250Bk
References

[edit] berkelium

97 curium ← berkelium → californium Tb ↑ Bk ↓ (Uqs) Periodic Table - Extended Periodic Table
General
Name, Symbol, Number	berkelium, Bk, 97
Chemical series	actinides
Group, Period, Block	???, 7, f
Appearance	unknown, probably silvery white or metallic gray
Atomic mass	(247) g/mol
Electron configuration	[Rn] 5f9 7s2
Electrons per shell	2, 8, 18, 32, 27, 8, 2
Phase	solid
Density (near r.t.)	(alpha) 14.78 g·cm−3
Density (near r.t.)	(beta) 13.25 g·cm−3
Melting point	(beta) 1259 K (986 °C, 1807 °F)
Electronegativity	1.3 (Pauling scale)
Ionization energies	1st: 601 kJ/mol
Magnetic ordering	no data
Thermal conductivity	(300 K) 10 W·m−1·K−1
CAS registry number	7440-40-6
Selected isotopes
Main article: Isotopes of femto/elements e11 iso NA half-life DM DE (MeV) DP 245Bk syn 4.94 d ε 0.810 245Cm 245Bk syn 4.94 d α 6.455 241Am 246Bk syn 1.8 d α 6.070 242Am 246Bk syn 1.8 d ε 1.350 246Cm 247Bk syn 1380 y α 5.889 243Am 248Bk syn >9 y α 5.803 244Am 249Bk syn 320 d α 5.526 245Am 249Bk syn 320 d SF  ? ?? 249Bk syn 320 d β- 0.125 249Cf
References

[edit] californium

98 berkelium ← californium → einsteinium Dy ↑ Cf ↓ (Uqo) Periodic Table - Extended Periodic Table
General
Name, Symbol, Number	californium, Cf, 98
Chemical series	actinides
Group, Period, Block	???, 7, f
Appearance	unknown, probably silvery white or metallic gray
Atomic mass	(251) g/mol
Electron configuration	[Rn] 5f10 7s2
Electrons per shell	2, 8, 18, 32, 28, 8, 2
Physical properties
Phase	solid
Density (near r.t.)	15.1 g·cm−3
Melting point	1173 K (900 °C, 1652 °F)
Electronegativity	1.3 (Pauling scale)
Ionization energies	1st: 608 kJ/mol
CAS registry number	7440-71-3
Selected isotopes
Main article: Isotopes of femto/elements e11 iso NA half-life DM DE (MeV) DP 248Cf syn 333.5 d SF  ? ?? 248Cf syn 333.5 d α 6.361 244Cm 249Cf syn 351 y SF  ? ?? 249Cf syn 351 y α 6.295 245Cm 250Cf syn 13.08 y α 6.128 246Cm 250Cf syn 13.08 y SF  ? ?? 251Cf syn 898 y α 6.176 247Cm 252Cf syn 2.645 y α 6.217 248Cm 252Cf syn 2.645 y SF  ? ?? 253Cf syn 17.81 d β- 0.285 253Es 253Cf syn 17.81 d α 6.124 249Cm 254Cf syn 60.5 d SF  ? ?? 254Cf syn 60.5 d α 5.926 250Cm
References

[edit] einsteinium

99 californium ← einsteinium → fermium Ho ↑ Es ↓ (Uqe) Periodic Table - Extended Periodic Table
General
Name, Symbol, Number	einsteinium, Es, 99
Chemical series	actinides
Group, Period, Block	???, 7, f
Appearance	unknown, probably silvery white or metallic gray
Atomic mass	(252) g/mol
Electron configuration	[Rn] 5f11 7s2
Electrons per shell	2, 8, 18, 32, 29, 8, 2
Phase	solid
Density (near r.t.)	8.84 g·cm−3
Melting point	1133 K (860 °C, 1580 °F)
Electronegativity	1.3 (Pauling scale)
Ionization energies	1st: 619 kJ/mol
Magnetic ordering	no data
CAS registry number	7429-92-7
Selected isotopes
Main article: Isotopes of femto/elements e11 iso NA half-life DM DE (MeV) DP 252Es syn 471.7 d α 6.760 248Bk 252Es syn 471.7 d ε 1.260 Cf 252Es syn 471.7 d β- 0.480 Fm 253Es syn 20.47 d SF  ? ?? 253Es syn 20.47 d α 6.739 249Bk 254Es syn 275.7 d ε 0.654 254Cf 254Es syn 275.7 d β 1.090 254Fm 254Es syn 275.7 d α 6.628 250Bk 255Es syn 39.8 d β- 0.288 255Fm 255Es syn 39.8 d α 6.436 251Bk 255Es syn 39.8 d SF  ? ??
References

[edit] fermium

100 einsteinium ← fermium → mendelevium Er ↑ Fm ↓ (Upn) Periodic Table - Extended Periodic Table
General
Name, Symbol, Number	fermium, Fm, 100
Chemical series	actinides
Group, Period, Block	???, 7, f
Appearance	unknown, probably silvery white or metallic gray
Atomic mass	(257) g/mol
Electron configuration	[Rn] 5f12 7s2
Electrons per shell	2, 8, 18, 32, 30, 8, 2
Phase	presumably a solid
Melting point	1800 K (1527 °C, 2781 °F)
Electronegativity	1.3 (Pauling scale)
Ionization energies	1st: 627 kJ/mol
CAS registry number	7440-72-4
Selected isotopes
Main article: Isotopes of femto/elements e11 iso NA half-life DM DE (MeV) DP 252Fm syn 25.39 h SF  ? ?? 252Fm syn 25.39 h α 7.153 248Cf 253Fm syn 3 d ε 0.333 253Es 253Fm syn 3 d α 7.197 249Cf 255Fm syn 20.07 h SF  ? ?? 255Fm syn 20.07 h α 7.241 251Cf 257Fm syn 100.5 d α 6.864 253Cf 257Fm syn 100.5 d SF  ? ??
References

[edit] mendelevium

101 fermium ← mendelevium → nobelium Tm ↑ Md ↓ (Upu) Periodic Table - Extended Periodic Table
General
Name, Symbol, Number	mendelevium, Md, 101
Chemical series	actinides
Group, Period, Block	???, 7, f
Appearance	unknown, probably silvery white or metallic gray
Atomic mass	(258) g/mol
Electron configuration	[Rn] 5f13 7s2
Electrons per shell	2, 8, 18, 32, 31, 8, 2
Phase	presumably a solid
Melting point	1100 K (827 °C, 1521 °F)
Electronegativity	1.3 (Pauling scale)
Ionization energies	1st: 635 kJ/mol
Magnetic ordering	no data
CAS registry number	7440-11-1
Selected isotopes
Main article: Isotopes of femto/elements e11 iso NA half-life DM DE (MeV) DP 257Md syn 5.52 h ε 0.406 257Fm 257Md syn 5.52 h α 7.558 253Es 257Md syn 5.52 h SF  ? ?? 258Md syn 51.5 d ε 1.230 258Fm 260Md syn 31.8 d SF  ? ?? 260Md syn 31.8 d α 7.000 256Es 260Md syn 31.8 d ε  ? 260Fm 260Md syn 31.8 d β- 1.000 260No
References

[edit] nobelium

102 mendelevium ← nobelium → lawrencium Yb ↑ No ↓ (Upb) Periodic Table - Extended Periodic Table
General
Name, Symbol, Number	nobelium, No, 102
Chemical series	actinides
Group, Period, Block	???, 7, f
Appearance	unknown, probably silvery white or metallic gray
Atomic mass	(259) g/mol
Electron configuration	[Rn] 5f14 7s2
Electrons per shell	2, 8, 18, 32, 32, 8, 2
Phase	presumably a solid
Melting point	1100 K (827 °C, 1521 °F)
Electronegativity	1.3 (Pauling scale)
Ionization energies	1st: 642 kJ/mol
CAS registry number	10028-14-5
Selected isotopes
Main article: Isotopes of femto/elements e11 iso NA half-life DM DE (MeV) DP 253No syn 1.7 m α 8.440 249Fm 253No syn 1.7 m ε 3.200 253Md 255No syn 3.1 m α 8.445 251Fm 255No syn 3.1 m ε 2.012 255Md 259No syn 58 m α 7.910 255Fm 259No syn 58 m ε 0.500 259Md 259No syn 58 m SF  ? ??
References