Mendelevium
Mendelevium ( /ˌmɛndəˈlɛviəm/ or /ˌmɛndəˈliːviəm/) is a synthetic element with the symbol Md (formerly Mv) and the atomic number 101. A metallic radioactive transuranic element in the actinide series, mendelevium is usually synthesized by bombarding einsteinium with alpha particles. It was named after Dmitri Ivanovich Mendeleev, who created the Periodic Table. Mendeleev's periodic system is the fundamental way to classify all the chemical element...
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Chemical Element
The 101st Element in the Periodic Table
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Fermium
Fermium ( /ˈfɜrmiəm/ FUR-mee-əm) is a synthetic element with the symbol Fm. It is the 100th element in the periodic table and a member of the...
Symbol:
- Md
Atomic mass:
- 258 u (4.28E-16 µg )
Electronegativity (Pauling scale):
- 1.3
Isotopes:
- Mendelevium-250
- Mendelevium-247
- Mendelevium-261
- Mendelevium-256
- Mendelevium-260
- Mendelevium-246
- Mendelevium-262
- Mendelevium-258
- Mendelevium-245
- Mendelevium-257
Melting Point:
- 826.85 °C (1520.3 °F )
Ionization Energy:
- 6.58 eV (0.00000658 MeV )
Discovery Date:
- 1955
Electron Configuration:
- Rn 5f13 7s2
Namesake
Named after:
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Thorium
Thorium ( /ˈθɔəriəm/ THOHR-ee-əm) is a natural radioactive chemical element with the symbol Th and atomic number 90. It was discovered in 1828 and named after Thor, the Norse god of thunder. In nature, virtually all thorium is found as thorium-232, and it decays by emitting an alpha particle, and... -
Curium
Curium ( /ˈkjʊəriəm/ KEWR-ee-əm) is a transuranic radioactive chemical element with the symbol Cm and atomic number 96. This element of the actinide series was named after Marie Skłodowska-Curie and her husband Pierre Curie. Curium was first intentionally produced and identified in July 1944 by the... -
Nobelium
Nobelium ( /noʊˈbɛliəm/ noh-BEL-ee-əm or /noʊˈbiːliəm/ noh-BEE-lee-əm) is a synthetic element with the symbol No and atomic number 102. It was first correctly identified in 1966 by scientists at the Flerov Laboratory of Nuclear Reactions in Dubna, Soviet Union. Little is known about the element but... -
Neptunium
Neptunium ( /nɛpˈtjuːniəm/ nep-TEW-nee-əm) is a chemical element with the symbol Np and atomic number 93. A radioactive metal, neptunium is the first transuranic element and belongs to the actinide series. Its most stable isotope, Np, is a by-product of nuclear reactors and plutonium production and... -
Americium
Americium ( /ˌæməˈrɪsiəm/ AM-ə-RIS-ee-əm) is a transuranic radioactive chemical element that has the symbol Am and atomic number 95. This transuranic element of the actinide series is located in the periodic table below the lanthanide element europium, and thus by analogy was named after another... -
Plutonium
Plutonium ( /pluːˈtoʊniəm/ ploo-TOH-nee-əm) is a transuranic radioactive chemical element with the chemical symbol Pu and atomic number 94. It is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, forming a dull coating when oxidized. The element normally exhibits six...