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Toxicity: Both elemental fluorine and the fluoride ion are highly toxic.

The recommended maximum allowable concentration for a daily 8-hour time-weighted exposure is 0.1 ppm.

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However, topically applied fluoride (toothpaste, dental rinses) may help reduce the incidence of dental caries.

Appearance: At room temperature and pressure, pure fluorine is a very pale, greenish-yellow, pungent, corrosive gas. Solid fluorine is found in alpha and beta allotropes.

Member feedback about Paleomagnetism: Member feedback about Absolute dating: As the most flourine dating element, it is extremely reactive: The Latin word use in chronology seems to have begun in 5th century Visigothic Spain, where it appears in the History of Isidore of Seville, and in later texts.

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However, the element is named fluor in Greek and Russian. Properties: Fluorine has a melting point of -219.62°C (1 atm), boiling point of -188.14°C (1 atm), density of 1.696 g/l (0°C, 1 atm), specific gravity of liquid of 1.108 at its boiling point, and valence of 1. It is highly reactive, participating in reactions with virtually all organic and inorganic substances. Metals, glass, ceramics, carbon, and water will burn with a bright flame in fluorine.

It is possible that fluorine can substitute for hydrogen in organic reactions.

The alpha form is opaque, while the beta form is transparent.

Items such as bone that are in the soil will absorb flourine dating from the groundwater over time.

The Latin word use in chronology seems to have begun in 5th century Visigothic Spain, where it appears in the History of Isidore of Seville, and in later texts.

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