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fermiummendeleviumnobelium
Tm
Md
  
 
 
Known properties
Name, Symbol, NumberMendelevium, Md, 101
Chemical series Actinides
Period, Block 7 , f
Appearance unknown; probably metallic,
silvery white or gray
Atomic weight 1 E-25 kg|[258] amu]]
Electron configurationElectron configuration is the arrangement of electrons in an atom, molecule or other body. Specifically, it is the placement of electrons into atomic, molecular, or other forms of electron orbitals. Orbitals, states, and wavefunctions Since electrons are [ RnAstatine Radon Xe Rn Uuo Full table General Name, Symbol, NumberRadon, Rn, 86 Chemical series Noble gases Group, Period, Block 18 (VIIIA), 6 , p Density, Hardness 9. 73 kg/m3 (273 K), NA Appearance colorless Atomic properties Atomic weight [222] amu Atomi]5f13 7 s2
e-The electron (also called negatron commonly represented as e&minus is a subatomic particle. In an atom the electrons surround the nucleus of protons and neutrons in an electron configuration. Electrons have the smallest electrical charge and when they mov 's per energy levelAn energy level is a quantified stable energy, which a physical system can have; the term is most commonly used in reference to the electron configuration of electrons, in atoms or molecules. According to quantum theory, only certain energy levels are pos2, 8, 18, 32, 31, 8, 2
State of matter Presumably a solid
Most stable isotopes
isoIsotopes are atoms of a chemical element whose nuclei have the same atomic number, Z but different atomic weights, A''. The word isotope meaning at the same place comes from the fact that isotopes are located at the same place on the periodic table. The a NANatural abundance refers to the prevalence of different isotopes of an element as found in nature. The weighted (by natural abundance) average mass of these isotopes is the atomic weight listed for the element in the periodic table. The abundance of an el half-life DM DE M eV DP
257Md {syn.} 5.52 h ε
α
SF
0.406
7.558
 
257 Fm
253 Es
 
258Md{syn.} 51.5 d ε1.230258Fm
260Md{syn.}31.8 dSF
α
ε
β-
 
7.000
 
1.000
 
256Es
260Fm
260 No

Mendelevium (also known as unnilunium) is a synthetic element in the periodic table with the symbol Md (formerly Mv) and the atomic number 101. A metallic radioactive transuranic element of the actinides, mendelevium is synthesized by bombarding einsteinium with alpha particles and was named after Dmitri Mendeleev.





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