
Protactinium (Pa) is a chemical element of the periodic table, located in the period 7, and has the atomic number 91. It is the third element in the actinide series. It is a shiny, silvery-gray metal whose name comes from the Greek word “protos”, which means first. It is highly toxic and is counted as one of the radioactive elements.
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– f block |
FAQs on Protactinium Element
Protactinium |
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‣ What does protactinium look like? Appearance: bright silvery metallic luster |
‣ Who discovered protactinium? When was the element protactinium discovered? Prediction: Dimitri Mendeleev (1869) Discovery and first isolation: Kasimir Fajans and Oswald Helmuth Gohring (1913) |
‣ Where is protactinium found on the periodic table?![]() Location: Protactinium is found in the seventh row of the periodic table, next to the thorium element. |
‣ Protactinium atomic number (Z): 91 |
‣ What is the correct symbol for protactinium? Symbol: Pa |
‣ What is the atomic weight for protactinium? Standard atomic weight: 231.03588 |
‣ What block is protactinium in the periodic table? Block: f-block |
‣ What period is protactinium in on the periodic table? Period: 7 |
‣ Protactinium atomic radius: empirical: 163 pm |
‣ Protactinium covalent radius: 200 pm |
‣ What is the melting point of protactinium? Melting point: 1841 K (1568 °C, 2854 °F) |
‣ What is protactinium boiling point? Boiling point: 4300 K (4027 °C, 7280 °F) |
‣ How many shells does protactinium have? Electrons per shell: 2, 8, 18, 32, 20, 9, 2 |
‣ What is the electron configuration for protactinium? Electron configuration: [Rn] 5f2 6d1 7s2 |
‣ Protactinium ionization energies:1st: 568 kJ/mol |
‣ Is protactinium a solid, liquid or gas? Phase (at r.t): solid |
‣ What is the density of the element protactinium? Density (near r.t): 15.37 g/cm3 |
‣ Protactinium magnetic ordering: paramagnetic |
‣ Protactinium natural occurrence: from decay |
‣ Protactinium oxidation state: +4, +5 |
‣ What is the electronegativity of protactinium? Electronegativity: Pauling scale: 1.5 |
‣ Protactinium heat of fusion: 12.34 kJ/mol |
‣ Protactinium heat of vaporization: 481 kJ/mol |
‣ What is the crystal structure of protactinium? Crystal structure: body-centered tetragonal |
‣ Thermal expansion of protactinium: ~9.9 µm/(m.K) (at r.t) |
‣ Thermal conductivity of protactinium: 47 W/(m.K) |
‣ Protactinium electrical resistivity: 177 nΩ.m (at 0 °C) |
‣ Protactinium CAS number: 7440-13-3 |
‣ How many isotopes does protactinium have?
Main isotopes of protactinium | ||||
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Isotope | Abundance | Half-life (t1/2) | Decay mode | Product |
229Pa | syn | 1.5 d | ε | 229Th |
230Pa | syn | 17.4 d | ε | 230Th |
231Pa | 100 % | 3.276 × 104 y | α | 227Ac |
232Pa | syn | 1.31 d | β– | 232U |
233Pa | trace | 26.967 d | β– | 233U |
234Pa | trace | 6.75 h | β– | 234U |
234Pa | trace | 1.17 min | β– | 234U |
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