
Argon (Ar) is a chemical element of the periodic table, located in the group 18 and the period 3, and is having the atomic number 18. It is a colorless, odorless, tasteless gas, whose name comes from the Greek word “argos”, which means lazy or inactive. It is a member of the noble gas group.
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– p block |
FAQs on Argon Element
Argon |
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‣ What does argon look like? Appearance: colorless gas exhibiting a lilac/violet glow when placed in an electric field |
‣ When was argon discovered and who discovered it? Discovery and first isolation: Lord Rayleigh and William Ramsay (1894) |
‣ Where is argon located on the periodic table?![]() Location: Argon is found in the eighteenth column of the periodic table below the neon element. |
‣ What is argon atomic number? Atomic number (Z): 18 |
‣ What’s the chemical symbol for argon? Symbol: Ar |
‣ What is the atomic weight of argon? Standard atomic weight: [39.792, 39.963] conventional: 39.95 |
‣ What block is argon in the periodic table? Block: p-block |
‣ What group does argon belong to? Group: 18 (noble gases) |
‣ What period is argon in on the periodic table? Period: 3 |
‣ Argon covalent radius: 106±10 pm |
‣ Argon Van der Waals radius: 188 pm |
‣ What is the melting point of argon? Melting point: 83.81 K (-189.34 °C, -308.81 °F) |
‣ What is the boiling point of argon? Boiling point: 87.302 K (-185.848 °C, -302.526 °F) |
‣ Argon critical point: 150.687 K, 4.863 MPa |
‣ Argon triple point: 83.8058 K, 68.89 kPa |
‣ How many electron shells does argon have? Electrons per shell: 2, 8, 8 |
‣ What is the ground state electron configuration of argon? Electron configuration: [Ne] 3s2 3p6 |
‣ What is argon ionization energy? Ionization energies: 1st: 1520.6 kJ/mol 2nd: 2665.8 kJ/mol 3rd: 3931 kJ/mol |
‣ What phase is argon normally found in? Phase (at r.t): gas |
‣ What is the density of argon at STP? Density (at STP): 1.784 g/L when liquid (at b.p): 1.3954 g/cm3 |
‣ Argon magnetic ordering: diamagnetic |
‣ Argon natural occurrence: primordial |
‣ What is the oxidation state of argon? Oxidation state: 0 |
‣ What is the electronegativity value of argon? Electronegativity: Pauling scale: no data |
‣ Argon heat of fusion: 1.18 kJ/mol |
‣ Argon heat of vaporization: 6.53 kJ/mol |
‣ Argon molar heat capacity: 20.85 J/(mol K) |
‣ Argon molar magnetic susceptibility: -19.6 × 10-6 cm3/mol |
‣ Speed of sound in argon: 323 m/s (gas, at 27 °C) |
‣ Argon crystal structure: face-centered cubic (fcc) |
‣ Thermal conductivity of argon: 17.72 × 10-3 W/(m.K) |
‣ Argon CAS number: 7440-37-1 |
‣ Argon vapor pressure
Vapor pressure | ||||||
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P (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k |
at T (K) | 47 | 53 | 61 | 71 | 87 |
‣ How many isotopes does argon have?
Main isotopes of argon | ||||
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Isotope | Abundance | Half-life (t1/2) | Decay mode | Product |
36Ar | 0.334 % | stable | ||
37Ar | syn | 35 d | ε | 37Cl |
38Ar | 0.063 % | stable | ||
39Ar | trace | 269 y | β– | 39K |
40Ar | 99.604 % | stable | ||
41Ar | syn | 109.34 min | β– | 41K |
42Ar | syn | 32.9 y | β– | 42K |
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