
Lawrencium (Lr) is a chemical element of the periodic table, located in the group 3 and the period 7, and has the atomic number 103. It is the last element in the actinide series. It is a silvery-white metal which is named after the American scientist Ernest O. Lawrence, inventor of the cyclotron. It is the eleventh transuranium element and is counted as one of the radioactive elements.
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– d block |
FAQs on Lawrencium Element
Lawrencium |
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‣ What does lawrencium look like? Appearance: silvery (predicted) |
‣ Who discovered lawrencium and in what year? Discovery: Lawrence Berkeley National Laboratory and Joint Institute for Nuclear Research (1961-1971) |
‣ Where is lawrencium on the periodic table?![]() Location: Lawrencium is found in the seventh row of the periodic table, next to the nobelium element. |
‣ What is the atomic number of lawrencium? Atomic number (Z): 103 |
‣ Lawrencium symbol: Lr |
‣ What is the atomic weight for lawrencium? Standard atomic weight: [266] |
‣ Lawrencium belongs to which block in the periodic table? Block: d-block |
‣ What is the group number of the element lawrencium? Group: 3 |
‣ Period of lawrencium in the periodic table Period: 7 |
‣ What is the melting point for lawrencium? Melting point: 1900 K (1627 °C, 2961 °F) (predicted) |
‣ How many electron shells does lawrencium have? Electrons per shell: 2, 8, 18, 32, 32, 8, 3 |
‣ What is the electron configuration of lawrencium? Electron configuration: [Rn] 5f14 7s2 7p1 |
‣ Lawrencium ionization energies: 1st: 478.6 kJ/mol 2nd: 1428.0 kJ/mol (predicted) 3rd: 2219.1 kJ/mol (predicted) |
‣ Is lawrencium a solid, liquid or gas? Phase (at r.t): solid (predicted) |
‣ Lawrencium density (near r.t): 14.4 g/cm3 (predicted) |
‣ Lawrencium natural occurrence: synthetic |
‣ Lawrencium oxidation state: +3 |
‣ What is the electronegativity of lawrencium? Electronegativity: Pauling scale: 1.3 (predicted) |
‣ Lawrencium crystal structure: hexagonal close-packed (hcp) (predicted) |
‣ Lawrencium CAS number: 22537-19-5 |
‣ How many isotopes does lawrencium have?
Main isotopes of lawrencium | ||||
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Isotope | Abundance | Half-life (t1/2) | Decay mode | Product |
254Lr | syn | 13 s | 78 % α 22 % ε | 250Md 254No |
255Lr | syn | 21.5 s | α | 251Md |
256Lr | syn | 27 s | α | 252Md |
259Lr | syn | 6.2 s | 78 % α 22 % SF | 255Md |
260Lr | syn | 2.7 min | α | 256Md |
261Lr | syn | 44 min | SF/ε? | |
262Lr | syn | 3.6 h | ε | 262No |
264Lr | syn | 3 h | SF | |
266Lr | syn | 10 h | SF |
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