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At room temperature, fluorine is a gas of diatomic molecules, [5] ... arsenic, and antimony are ... metals, and organic matter.
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]
Manganese tetrafluoride is an unstable solid that decomposes even at room temperature. [62] Only one of the two allotropes, α-MnF 4 , is understood. In this compound, manganese forms –MnF 6 – octahedra which share bridging fluorines to make –Mn 4 F 20 – rings which are then further connected three dimensionally.
This compound is generally regarded as stable, since at room temperature it decomposes only slowly. At temperatures of 250–300 °C decomposition to arsenic and hydrogen is rapid. [34] Several factors, such as humidity, presence of light and certain catalysts (namely aluminium) facilitate the rate of decomposition. [35]
One of the simplest arsenic compound is the trihydride, the highly toxic, flammable, pyrophoric arsine (AsH 3). This compound is generally regarded as stable, since at room temperature it decomposes only slowly. At temperatures of 250–300 °C decomposition to arsenic and hydrogen is rapid. [3]
As temperature rises, the conductivity of metals decreases while that of nonmetals increases. [243] However, plutonium, carbon, arsenic, and antimony appear to defy the norm. When plutonium (a metal) is heated within a temperature range of −175 to +125 °C its conductivity increases. [244]
Henri Moissan's 1892 record of fluorine gas color, viewed end-on in a 5‑m tube. Air (1) is on the left, fluorine (2) is in the middle, chlorine (3) is on the right. Fluorine forms diatomic molecules (F 2) that are gaseous at room temperature with a density about 1.3 times that of air.
Arsenic trifluoride is a chemical compound of arsenic and fluorine with the chemical formula AsF 3. It is a colorless liquid which reacts readily with water. [ 3 ] Like other inorganic arsenic compounds, it is highly toxic .