Mendelevium is a metallic radioactive transuranic element and is the first element that currently cannot be produced in macroscopic quantities through neutron bombardment of lighter elements. 16 isotopes are known, the most stable being 258Md with a half-life of 51 days; nevertheless, the shorter-lived 256Md (half-life 1.27 hours) is most commonly used in chemistry because it can be produced on a larger scale. Discovered by bombarding einsteinium with alpha particles, the same method still used to produce it today. Using available microgram quantities of the isotope einsteinium-253, over a million mendelevium atoms may be produced each hour.

Mendelevium is a metallic radioactive transuranic element and is the first element that currently cannot be produced in macroscopic quantities through neutron bombardment of lighter elements. 16 isotopes are known, the most stable being 258Md with a half-life of 51 days; nevertheless, the shorter-lived 256Md (half-life 1.27 hours) is most commonly used in chemistry because it can be produced on a larger scale. Discovered by bombarding einsteinium with alpha particles, the same method still used to produce it today. Using available microgram quantities of the isotope einsteinium-253, over a million mendelevium atoms may be produced each hour.

Mendelevium is a metallic radioactive transuranic element and is the first element that currently cannot be produced in macroscopic quantities through neutron bombardment of lighter elements. 16 isotopes are known, the most stable being 258Md with a half-life of 51 days; nevertheless, the shorter-lived 256Md (half-life 1.27 hours) is most commonly used in chemistry because it can be produced on a larger scale. Discovered by bombarding einsteinium with alpha particles, the same method still used to produce it today. Using available microgram quantities of the isotope einsteinium-253, over a million mendelevium atoms may be produced each hour.

Mendelevium is a metallic radioactive transuranic element and is the first element that currently cannot be produced in macroscopic quantities through neutron bombardment of lighter elements. 16 isotopes are known, the most stable being 258Md with a half-life of 51 days; nevertheless, the shorter-lived 256Md (half-life 1.27 hours) is most commonly used in chemistry because it can be produced on a larger scale. Discovered by bombarding einsteinium with alpha particles, the same method still used to produce it today. Using available microgram quantities of the isotope einsteinium-253, over a million mendelevium atoms may be produced each hour.

Mendelevium is a metallic radioactive transuranic element and is the first element that currently cannot be produced in macroscopic quantities through neutron bombardment of lighter elements. 16 isotopes are known, the most stable being 258Md with a half-life of 51 days; nevertheless, the shorter-lived 256Md (half-life 1.27 hours) is most commonly used in chemistry because it can be produced on a larger scale. Discovered by bombarding einsteinium with alpha particles, the same method still used to produce it today. Using available microgram quantities of the isotope einsteinium-253, over a million mendelevium atoms may be produced each hour.

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1955 by Glenn T. Seaborg, Albert Ghiorso, Bernard Harvey, Gregory Choppin and Stanley G. Thompson, USA.

1955 by Glenn T. Seaborg, Albert Ghiorso, Bernard Harvey, Gregory Choppin and Stanley G. Thompson, USA.

1955 by Glenn T. Seaborg, Albert Ghiorso, Bernard Harvey, Gregory Choppin and Stanley G. Thompson, USA.

1955 by Glenn T. Seaborg, Albert Ghiorso, Bernard Harvey, Gregory Choppin and Stanley G. Thompson, USA.

1955 by Glenn T. Seaborg, Albert Ghiorso, Bernard Harvey, Gregory Choppin and Stanley G. Thompson, USA.

DISCOVERY

DISCOVERY

DISCOVERY

DISCOVERY

DISCOVERY

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From the name of Dimitri Mendeleev, Chemist, who greatly contributed to the periodic table.

From the name of Dimitri Mendeleev, Chemist, who greatly contributed to the periodic table.

From the name of Dimitri Mendeleev, Chemist, who greatly contributed to the periodic table.

From the name of Dimitri Mendeleev, Chemist, who greatly contributed to the periodic table.

From the name of Dimitri Mendeleev, Chemist, who greatly contributed to the periodic table.

ETYMOLOGY

ETYMOLOGY

ETYMOLOGY

ETYMOLOGY

ETYMOLOGY

---

---

Mendelevium

Mendelevium

Mendelevium

Mendelevium

Mendelevium

---

Element

Element

Element

Element

Element

---

Md

Md

Md

Md

Md

---

Symbol

Symbol

Symbol

Symbol

Symbol

---

---

---

101

101

101

101

101

---

Atomic Number

Atomic Number

Atomic Number

Atomic Number

Atomic Number

---

Actinide

Actinide

Actinide

Actinide

Actinide

---

Classification

Classification

Classification

Classification

Classification

---

7440-11-1

7440-11-1

7440-11-1

7440-11-1

7440-11-1

---

CAS Number

CAS Number

CAS Number

CAS Number

CAS Number

---

-

-

-

-

-

---

Elemental Colour

Elemental Colour

Elemental Colour

Elemental Colour

Elemental Colour

---

-

-

-

-

-

---

Refractive Index

Refractive Index

Refractive Index

Refractive Index

Refractive Index

---

-

-

-

-

-

---

Poisson Ratio

Poisson Ratio

Poisson Ratio

Poisson Ratio

Poisson Ratio

---

25.155 cm³

25.155 cm³

25.155 cm³

25.155 cm³

25.155 cm³

---

Molar Volume

Molar Volume

Molar Volume

Molar Volume

Molar Volume

---

-

-

-

-

-

---

Brinell Hardness

Brinell Hardness

Brinell Hardness

Brinell Hardness

Brinell Hardness

---

-

-

-

-

-

---

Mohs Hardness

Mohs Hardness

Mohs Hardness

Mohs Hardness

Mohs Hardness

---

-

-

-

-

-

---

Vickers Hardness

Vickers Hardness

Vickers Hardness

Vickers Hardness

Vickers Hardness

---

-

-

-

-

-

---

Speed of Sound

Speed of Sound

Speed of Sound

Speed of Sound

Speed of Sound

---

-

-

-

-

-

---

Bulk Modulus

Bulk Modulus

Bulk Modulus

Bulk Modulus

Bulk Modulus

---

-

-

-

-

-

---

Shear Modulus

Shear Modulus

Shear Modulus

Shear Modulus

Shear Modulus

---

-

-

-

-

-

---

Young Modulus

Young Modulus

Young Modulus

Young Modulus

Young Modulus

---

---

---

Allotropes

Allotropes

Allotropes

Allotropes

Allotropes

---

NONE

NONE

NONE

NONE

NONE

---

---

1,100.15 K, 827.00 °C

1,100.15 K, 827.00 °C

1,100.15 K, 827.00 °C

1,100.15 K, 827.00 °C

827.00 °C

---

Melting Point

Melting Point

Melting Point

Melting Point

Melting Point

---

-

-

-

-

-

---

Boiling Point

Boiling Point

Boiling Point

Boiling Point

Boiling Point

---

-

-

-

-

-

---

Automatic Ignition

Automatic Ignition

Automatic Ignition

Automatic Ignition

Automatic Ignition

---

-

-

-

-

-

---

Flashpoint

Flashpoint

Flashpoint

Flashpoint

Flashpoint

---

-

-

-

-

-

---

Critical Temperature

Critical Temperature

Critical Temperature

Critical Temperature

Critical Temperature

---

-

-

-

-

-

---

Critical Pressure

Critical Pressure

Critical Pressure

Critical Pressure

Critical Pressure

---

-

-

-

-

-

---

Thermal Conductivity

Thermal Conductivity

Thermal Conductivity

Thermal Conductivity

Thermal Conductivity

---

-

-

-

-

-

---

Thermal Expansion

Thermal Expansion

Thermal Expansion

Thermal Expansion

Thermal Expansion

---

-

-

-

-

-

---

Specific Heat

Specific Heat

Specific Heat

Specific Heat

Specific Heat

---

-

-

-

-

-

---

Heat Fusion

Heat Fusion

Heat Fusion

Heat Fusion

Heat Fusion

---

-

-

-

-

-

---

Heat Vaporisation

Heat Vaporisation

Heat Vaporisation

Heat Vaporisation

Heat Vaporisation

---

-

-

-

-

-

---

Heat Combustion

Heat Combustion

Heat Combustion

Heat Combustion

Heat Combustion

---

-

-

-

-

-

---

Curie Point

Curie Point

Curie Point

Curie Point

Curie Point

---

-

-

-

-

-

---

Neel Point

Neel Point

Neel Point

Neel Point

Neel Point

---

-

-

-

-

-

---

Adiabatic Index

Adiabatic Index

Adiabatic Index

Adiabatic Index

Adiabatic Index

---

Solid

Solid

Solid

Solid

Solid

---

Phase

Phase

Phase

Phase

Phase

-

-

-

-

-

---

Electrical Type

Electrical Type

Electrical Type

Electrical Type

Electrical Type

---

-

-

-

-

-

---

Conductivity

Conductivity

Conductivity

Conductivity

Conductivity

---

-

-

-

-

-

---

Resistivity

Resistivity

Resistivity

Resistivity

Resistivity

---

-

-

-

-

-

---

Superconducting Point

Superconducting Point

Superconducting Point

Superconducting Point

Superconducting Point

---

-

-

-

-

-

---

Magnetic Type

Magnetic Type

Magnetic Type

Magnetic Type

Magnetic Type

---

-

-

-

-

-

---

Mass Susceptibility

Mass Susceptibility

Mass Susceptibility

Mass Susceptibility

Mass Susceptibility

---

-

-

-

-

-

---

Molar Susceptibility

Molar Susceptibility

Molar Susceptibility

Molar Susceptibility

Molar Susceptibility

---

-

-

-

-

-

---

Volume Susceptibility

Volume Susceptibility

Volume Susceptibility

Volume Susceptibility

Volume Susceptibility

Material Composition

Material Composition

Material Composition

Material Composition

Material Composition

---

-

-

-

-

-

---

Universe

Universe

Universe

Universe

Universe

---

-

-

-

-

-

---

Meteorites

Meteorites

Meteorites

Meteorites

Meteorites

---

-

-

-

-

-

---

Sun

Sun

Sun

Sun

Sun

---

-

-

-

-

-

---

Earth Crust

Earth Crust

Earth Crust

Earth Crust

Earth Crust

---

-

-

-

-

-

---

Oceans

Oceans

Oceans

Oceans

Oceans

---

-

-

-

-

-

---

Humans

Humans

Humans

Humans

Humans

259.101'040'8

259.101'040'8

259.101'040'8

259.101'040'8

259.101'040'8

---

Atomic Weight

Atomic Weight

Atomic Weight

Atomic Weight

Atomic Weight

---

-

-

-

-

-

---

Atomic Radius

Atomic Radius

Atomic Radius

Atomic Radius

Atomic Radius

---

173 pm

173 pm

173 pm

173 pm

173 pm

---

Covalent Radius Single Bond

Covalent Radius Single Bond

Covalent Radius Single Bond

Covalent Radius Single Bond

Covalent Radius Single Bond

---

139 pm

139 pm

139 pm

139 pm

139 pm

---

Covalent Radius Double Bond

Covalent Radius Double Bond

Covalent Radius Double Bond

Covalent Radius Double Bond

Covalent Radius Double Bond

---

-

-

-

-

-

---

Covalent Radius Triple Bond

Covalent Radius Triple Bond

Covalent Radius Triple Bond

Covalent Radius Triple Bond

Covalent Radius Triple Bond

---

246 pm

246 pm

246 pm

246 pm

246 pm

---

Van der Waals Radius

Van der Waals Radius

Van der Waals Radius

Van der Waals Radius

Van der Waals Radius

---

[Rn]7s²5f¹³

[Rn]7s²5f¹³

[Rn]7s²5f¹³

[Rn]7s²5f¹³

[Rn]7s²5f¹³

---

Electron Configuration

Electron Configuration

Electron Configuration

Electron Configuration

Electron Configuration

---

Cubic, Face-centred

Cubic, Face-centred

Cubic, Face-centred

Cubic, Face-centred

Cubic, Face-centred

---

Crystal Structure

Crystal Structure

Crystal Structure

Crystal Structure

Crystal Structure

---

10.300'00 g/cm³

10.300'00 g/cm³

10.300'00 g/cm³

10.300'00 g/cm³

10.300'00 g/cm³

---

Density as Solid

Density as Solid

Density as Solid

Density as Solid

Density as Solid

---

-

-

-

-

-

---

Density as Liquid

Density as Liquid

Density as Liquid

Density as Liquid

Density as Liquid

---

-

-

-

-

-

---

Density as Gas

Density as Gas

Density as Gas

Density as Gas

Density as Gas

---

-

-

-

-

-

---

Space Group Name

Space Group Name

Space Group Name

Space Group Name

Space Group Name

---

-

-

-

-

-

---

Space Group Number

Space Group Number

Space Group Number

Space Group Number

Space Group Number

---

-

-

-

-

-

---

Lattice Angles

Lattice Angles

Lattice Angles

Lattice Angles

Lattice Angles

---

-

-

-

-

-

---

Lattice Constants

Lattice Constants

Lattice Constants

Lattice Constants

Lattice Constants

3

3

3

3

3

---

Valence

Valence

Valence

Valence

Valence

---

1.3

1.3

1.3

1.3

1.3

---

Electronegativity

Electronegativity

Electronegativity

Electronegativity

Electronegativity

---

-

-

-

-

-

---

Electron Affinity

Electron Affinity

Electron Affinity

Electron Affinity

Electron Affinity

---

---

---

Ionisation Energy

Ionisation Energy

Ionisation Energy

Ionisation Energy

Ionisation Energy

---

---

---

51.50 days

51.50 days

51.50 days

51.50 days

51.50 days

---

Half Life

Half Life

Half Life

Half Life

Half Life

---

74.31 days

74.31 days

74.31 days

74.31 days

74.31 days

---

Lifetime

Lifetime

Lifetime

Lifetime

Lifetime

---

5f¹³ = 5, 3, +2, -1/2

5f¹³ = 5, 3, +2, -1/2

5f¹³ = 5, 3, +2, -1/2

5f¹³ = 5, 3, +2, -1/2

5f¹³ = 5, 3, +2, -1/2

---

Quantum Numbers

Quantum Numbers

Quantum Numbers

Quantum Numbers

Quantum Numbers

---

-

-

-

-

-

---

Neutron Cross Section

Neutron Cross Section

Neutron Cross Section

Neutron Cross Section

Neutron Cross Section

---

-

-

-

-

-

---

Neutron Mass Absorption

Neutron Mass Absorption

Neutron Mass Absorption

Neutron Mass Absorption

Neutron Mass Absorption

---

---

---

Stable Isotopes

Stable Isotopes

Stable Isotopes

Stable Isotopes

Stable Isotopes

---

NONE

NONE

NONE

NONE

NONE

---

---

---

Unstable Isotopes

Unstable Isotopes

Unstable Isotopes

Unstable Isotopes

Unstable Isotopes

---

---

---

---

Isotopes Overview

Isotopes Overview

Isotopes Overview

Isotopes Overview

Isotopes Overview

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---

---