
Arsenic (As) is a chemical element of the periodic table, located in the group 15 and the period 4, and is having the atomic number 33. It is a brittle, silvery-grey metalloid, whose name comes from the Greek word “arsenikon”, which means the yellow pigment orpiment. It has three allotropes: grey, yellow and black. It is a member of the pnictogen group.
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– p block |
FAQs on Arsenic Element
Arsenic |
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‣ What does arsenic look like? Appearance: metallic grey |
‣ When was the element arsenic discovered and by who? Discovery: Arabic alchemists (before AD 815) |
‣ Where is arsenic located on the periodic table?![]() Location: Arsenic is found in the fourth row of the periodic table below the phosphorus element. |
‣ What is arsenic atomic number? Atomic number (Z): 33 |
‣ What is the chemical symbol for arsenic? Symbol: As |
‣ What is the atomic weight of arsenic? Standard atomic weight: 74.921595 |
‣ What block is arsenic in the periodic table? Block: p-block |
‣ What group is arsenic in on the periodic table? Group: 15 (pnictogens) |
‣ Which period does arsenic belong to? Period: 4 |
‣ What is the atomic radius of arsenic? Atomic radius: empirical: 119 pm |
‣ Arsenic covalent radius: 119±4 pm |
‣ Arsenic Van der Waals radius: 185 pm |
‣ What is arsenic’s melting point? Melting point: 1089.95 K (816.8 °C, 1502 °F) |
‣ What is the boiling point of arsenic? Boiling point: 886.15 K (613 °C, 1135 °F) |
‣ Arsenic sublimation point: 887 K (615 °C, 1137 °F) |
‣ Arsenic critical point: 1673 K, ? MPa |
‣ Arsenic triple point: 1090 K, 3628 kPa |
‣ How many electron shells does arsenic have? Electrons per shell: 2, 8, 18, 5 |
‣ What is the ground state electron configuration for arsenic? Electron configuration: [Ar] 3d10 4s2 4p3 |
‣ Arsenic allotropes: grey (most common), yellow, black |
‣ What is arsenic ionization energy? Ionization energies: 1st: 947.0 kJ/mol 2nd: 1798 kJ/mol 3rd: 2735 kJ/mol |
‣ In what phase is arsenic normally found? Phase (at r.t): solid |
‣ What is arsenic density? Density (near r.t): 5.727 g/cm3 when liquid (at m.p): 5.22 g/cm3 |
‣ Arsenic magnetic ordering: diamagnetic |
‣ Arsenic natural occurrence: primordial |
‣ What is the oxidation state of arsenic? Oxidation state: -3, 0, +3, +5 |
‣ What’s the electronegativity of arsenic? Electronegativity: Pauling scale: 2.18 |
‣ Arsenic heat of fusion: grey: 24.44 kJ/mol |
‣ Arsenic heat of vaporization: 34.76 kJ/mol |
‣ Arsenic molar heat capacity: 24.64 J/(mol K) |
‣ Arsenic molar magnetic susceptibility: -5.5 × 10-6 cm3/mol |
‣ Arsenic crystal structure: rhombohedral |
‣ Thermal expansion of arsenic: 5.6 µm/(m.K) (at r.t) |
‣ Thermal conductivity of arsenic: 50.2 W/(m.K) |
‣ Arsenic electrical resistivity: 333 nΩ.m (at 20 °C) |
‣ What is the hardness of arsenic? Mohs hardness: 3.5 Brinell hardness: 1440 MPa |
‣ Young’s modulus of arsenic: 8 GPa |
‣ Bulk modulus of arsenic: 22 GPa |
‣ Arsenic CAS number: 7440-38-2 |
‣ Arsenic vapor pressure
Vapor pressure | ||||||
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P (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k |
at T (K) | 553 | 596 | 646 | 706 | 781 | 874 |
‣ How many isotopes does arsenic have?
Main isotopes of arsenic | ||||
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Isotope | Abundance | Half-life (t1/2) | Decay mode | Product |
73As | syn | 80.3 d | ε γ | 73Ge – |
74As | syn | 17.8 d | ε β+ γ β– | 74Ge 74Ge – 74Se |
75As | 100 % | stable |
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