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Arsenic is a chemical element with the symbol As and the atomic number 33. ... (Fe 3 O 4) nanocrystals have been demonstrated in point-of-use water purification.
The Gmelin rare earths handbook lists 1522 °C and 1550 °C as two melting points given in the literature, the most recent reference [Handbook on the chemistry and physics of rare earths, vol.12 (1989)] is given with 1529 °C.
In its standard state arsine is a colorless, denser-than-air gas that is slightly soluble in water (2% at 20 °C) [1] and in many organic solvents as well. [citation needed] Arsine itself is odorless, [5] but it oxidizes in air and this creates a slight garlic or fish-like scent when the compound is present above 0.5 ppm. [6]
Nitrogen's melting point is −210 °C and its boiling point is −196 °C. Phosphorus has a melting point of 44 °C and a boiling point of 280 °C. Arsenic is one of only two elements to sublimate at standard pressure; it does this at 603 °C. Antimony's melting point is 631 °C and its boiling point is 1587 °C.
Arsenic only melts under a pressure of 38.6 atm, at 817 °C. [335] It is a semimetal with an electrical conductivity of around 3.9 × 10 4 S•cm −1 [336] and a band overlap of 0.5 eV. [337] [n 35] Liquid arsenic is a semiconductor with a band gap of 0.15 eV. [339] The chemistry of arsenic is predominately nonmetallic. [340]
Melting point: 312.2 °C (594.0 °F) Boiling point: 465 °C (869 °F) Solubility in water: ... Arsenic trioxide is an inorganic compound with the formula As 2 O 3. [5]
It can also be prepared by chlorination of arsenic at 80–85 °C, but this method requires elemental arsenic. [4] 2 As + 3 Cl 2 → 2 AsCl 3. Arsenic trichloride can be prepared by the reaction of arsenic oxide and sulfur monochloride. This method requires simple apparatus and proceeds efficiently: [8] 2 As 2 O 3 + 6 S 2 Cl 2 → 4 AsCl 3 + 3 ...
The melting point (or, rarely, liquefaction point) of a substance is the temperature at which it changes state from solid to liquid. At the melting point the solid and liquid phase exist in equilibrium. The melting point of a substance depends on pressure and is usually specified at a standard pressure such as 1 atmosphere or 100 kPa.