
Fermium (Fm) is a chemical element of the periodic table, located in the period 7, and has the atomic number 100. It is the twelfth element in the actinide series. It is a silvery-white metal which is named after the Italian-born nuclear physicist Enrico Fermi. It is the eighth transuranium element and is counted as one of the radioactive elements.
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– f block |
FAQs on Fermium Element
Fermium |
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‣ What does fermium look like? Appearance: silvery |
‣ Who discovered fermium and in what year? Discovery: Lawrence Berkeley National Laboratory (1952) |
‣ Fermium location on periodic table![]() Location: Fermium is found in the seventh row of the periodic table, next to the einsteinium element. |
‣ What is fermium atomic mass number? Atomic number (Z): 100 |
‣ Fermium symbol: Fm |
‣ What is fermium atomic weight? Standard atomic weight: [257] |
‣ What block does fermium belong to? Block: f-block |
‣ What period is fermium on the periodic table? Period: 7 |
‣ What is fermium melting point? Melting point: 1800 K (1527 °C, 2781 °F) (predicted) |
‣ How many electrons does fermium have? Electrons per shell: 2, 8, 18, 32, 30, 8, 2 |
‣ Fermium electron configuration: [Rn] 5f12 7s2 |
‣ Fermium ionization energies: 1st: 629 kJ/mol |
‣ What is the phase of fermium? Phase (at r.t): solid (predicted) |
‣ What is the density of the element fermium? Density (near r.t): 9.7 g/cm3 (predicted) |
‣ Fermium natural occurrence: synthetic |
‣ Fermium oxidation state: +3 |
‣ Fermium electronegativity: Pauling scale: 1.3 |
‣ What is the crystal structure of fermium? Crystal structure: face-centered cubic (fcc) (predicted) |
‣ Fermium CAS number: 7440-72-4 |
‣ How many isotopes does fermium have?
Main isotopes of fermium | ||||
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Isotope | Abundance | Half-life (t1/2) | Decay mode | Product |
252Fm | syn | 25.39 h | SF α | – 248Cf |
253Fm | syn | 3 d | ε α | 253Es 249Cf |
255Fm | syn | 20.07 h | SF α | – 251Cf |
257Fm | syn | 100.5 d | α SF | 253Cf – |
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