
Californium (Cf) is a chemical element of the periodic table, located in the period 7, and has the atomic number 98. It is the tenth element in the actinide series. It is a soft, malleable, silvery-white metal which is named after the state of California, where it was first made. It is the sixth transuranium element and is counted as one of the radioactive elements.
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– f block |
FAQs on Californium Element
Californium |
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‣ What does californium look like? Appearance: silvery |
‣ Who discovered californium and in what year? Discovery: Lawrence Berkeley National Laboratory (1950) |
‣ Where is californium on the periodic table?![]() Location: Californium is found in the seventh row of the periodic table, next to the berkelium element. |
‣ Californium atomic number (Z): 98 |
‣ What is californium’s symbol? Symbol: Cf |
‣ Californium atomic weight: [251] |
‣ What block does californium belong to? Block: f-block |
‣ What period is californium in the periodic table? Period: 7 |
‣ Californium melting point: 1173 K (900 °C, 1652 °F) |
‣ What is the boiling point of californium? Boiling point: 1743 K (1470 °C, 2678 °F) (estimation) |
‣ How many electron shells does californium have? Electrons per shell: 2, 8, 18, 32, 28, 8, 2 |
‣ What is the electron configuration of californium? Electron configuration: [Rn] 5f10 7s2 |
‣ Californium ionization energies: 1st: 608 kJ/mol |
‣ What is the phase of californium? Phase (at r.t): solid |
‣ Californium density (near r.t): 15.1 g/cm3 |
‣ Californium natural occurrence: synthetic |
‣ Californium oxidation state: +3 |
‣ What’s the electronegativity of californium? Electronegativity: Pauling scale: 1.3 |
‣ What is the structure of californium? Crystal structure: double hexagonal close-packed (dhcp) |
‣ Californium hardness Mohs hardness: 3-4 |
‣ Californium CAS number: 7440-71-3 |
‣ How many isotopes does californium have?
Main isotopes of californium | ||||
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Isotope | Abundance | Half-life (t1/2) | Decay mode | Product |
248Cf | syn | 333.5 d | α (100 %) SF (2.9 × 10-3 %) | 244Cm – |
249Cf | syn | 351 d | α (100 %) SF (5.0 × 10-7 %) | 245Cm – |
250Cf | syn | 13.08 y | α (99.92 %) SF (0.08 %) | 246Cm – |
251Cf | syn | 898 y | α | 247Cm |
252Cf | syn | 2.645 y | α (96.91 %) SF (3.09 %) | 248Cm – |
253Cf | syn | 17.81 d | β– (99.69 %) α (0.31 %) | 253Es 249Cm |
254Cf | syn | 60.5 d | SF (99.69 %) α (0.31 %) | – 250Cm |
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