
Oxygen (O) is a chemical element of the periodic table, located in the group 16 and the period 2, and is having the atomic number 8. It is a colorless, odorless, tasteless gas, whose name comes from the Greek word “oxy genes”, which means acid forming. It is a reactive nonmetal and is the first most abundant element on earth. It is the first element in the chalcogen group.
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– p block |
FAQs on Oxygen Element
Oxygen |
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‣ What does oxygen look like? Appearance: gas: colorless liquid and solid: pale blue |
‣ When was oxygen discovered and by whom? Discovery: Carl Wilhelm Scheele (1771) Named by: Antoine Lavoisier (1777) |
‣ Where is oxygen located on the periodic table?![]() Location: Oxygen is found in the second row of the periodic table, next to the nitrogen element. |
‣ What is oxygen’s atomic number? Atomic number (Z): 8 |
‣ What is oxygen’s symbol? Symbol: O |
‣ What is oxygen’s atomic weight? Standard atomic weight: [15.99903 , 15.99977] conventional: 15.999 |
‣ What block is oxygen in the periodic table? Block: p-block |
‣ What group is oxygen in on the periodic table? Group: 16 (chalcogens) |
‣ What period is oxygen in on the periodic table? Period: 8 |
‣ Oxygen covalent radius: 66±2 pm |
‣ Oxygen Van der Waals radius: 152 pm |
‣ What is oxygen’s melting point? Melting point: (O2) 54.36 K (-218.79 °C, -361.82 °F) |
‣ What is oxygen’s boiling point? Boiling point: (O2) 90.188 K (-182.962 °C, -297.332 °F) |
‣ Oxygen critical point: 154.581 K, 5.043 MPa |
‣ Oxygen triple point: 54.631 K, 0.1463 kPa |
‣ How many electron shells does oxygen have? Electrons per shell: 2, 6 |
‣ What is oxygen’s electron configuration? Electron configuration: [He] 2s2 2p4 |
‣ What are the allotropes of oxygen? Allotropes: O2 (dioxygen), O3 (ozone), O4 (tetraoxygen), metallic oxygen |
‣ What is oxygen ionization energy? Ionization energies: 1st: 1313.9 kJ/mol 2nd: 3388.3 kJ/mol 3rd: 5300.5 kJ/mol |
‣ What is oxygen’s phase at room temperature? Phase (at r.t): gas |
‣ What is oxygen’s density? Density (at STP): 1.429 g/L when liquid (at b.p): 1.141 g/cm3 |
‣ Oxygen magnetic ordering: paramagnetic |
‣ Oxygen natural occurrence: primordial |
‣ What is oxygen oxidation state? Oxidation state: -2 |
‣ What is oxygen’s electronegativity? Electronegativity: Pauling scale: 3.44 |
‣ Oxygen heat of fusion: (O2) 0.444 kJ/mol |
‣ Oxygen heat of vaporization: (O2) 6.82 kJ/mol |
‣ Oxygen molar heat capacity: (O2) 29.378 J/(mol K) |
‣ Oxygen molar magnetic susceptibility: +3449.0 × 10-6 cm3/mol (293 K) |
‣ Speed of sound in oxygen: 330 m/s (gas, at 27 °C) |
‣ What is the crystal structure of oxygen? Crystal structure: cubic |
‣ Thermal conductivity of oxygen: 26.58 × 10-3 W/(m.K) |
‣ Oxygen CAS number: 7782-44-7 |
‣ Oxygen vapor pressure
Vapor pressure | ||||||
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P (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k |
at T (K) | 61 | 73 | 90 |
‣ How many isotopes does oxygen have?
Main isotopes of oxygen | ||||
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Isotope | Abundance | Half-life (t1/2) | Decay mode | Product |
16O | 99.76 % | stable | ||
17O | 0.04 % | stable | ||
18O | 0.20 % | stable |
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