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Atomic oxygen, denoted O or O 1, is very reactive, as the individual atoms of oxygen tend to quickly bond with nearby molecules.Its lowest-energy electronic state is a spin triplet, designated by the term symbol 3 P.
9 Sagittarii is a spectroscopic binary containing O3.5 and O5–5.5 main sequence stars, making for the brightest star visible within the Lagoon Nebula. μ Columbae is a naked-eye O9.5 main sequence star. It is a runaway star.
Hydrogen: Helium: Lithium: Beryllium: Boron: Carbon: Nitrogen: Oxygen: Fluorine: Neon: Sodium: Magnesium: Aluminium: Silicon: Phosphorus: Sulfur: Chlorine: Argon ...
At intermediate O5–O8 classes, the distinction between "O((f))" main sequence, "O(f)" giants, and "Of" supergiants is well-defined and represents a definite increase in luminosity. The increasing strength of Si 3+ emission is also an indicator of increasing luminosity and this is the primary means of assigning luminosity classes to the late O ...
O5 or O-5 may refer to: The "Outreach 5", emerging economies in the Heiligendamm Process : China, Mexico, India, Brazil and South Africa A symbol for the anti-Nazi Austrian Resistance , where the 5 stands for E and OE is the abbreviation of Österreich
When the MKK classification scheme was first described in 1943, the only subtypes of class O used were O5 to O9.5. [72] The MKK scheme was extended to O9.7 in 1971 [73] and O4 in 1978, [74] and new classification schemes that add types O2, O3, and O3.5 have subsequently been introduced. [75] Spectral standards: [69] O7V – S Monocerotis; O9V ...
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Quartz is a common crystalline mineral made of silica, or silicon dioxide (SiO 2). The rest of the Earth's crust is formed also of oxygen compounds, most importantly calcium carbonate (in limestone) and silicates (in feldspars).