Magnesium is a chemical element with the symbol Mg and atomic number 12. It is a shiny gray metal that is an important component of many chemical compounds, including chlorophyll, the green pigment found in plants. Magnesium is the eighth most abundant element in the Earth’s crust and the third most abundant element in seawater. […]
The Harvey Lee Ross House is a two-story frame, side-gabled house built in approximately 1858 on the farm of Harvey Lee Ross near Vermont, Illinois. The house and several outbuildings were added to the National Register of Historic Places (NRHP) in 1996, based on the distinctive characteristics of the architecture and an association with the
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NASA created the James Webb Space Telescope with support from the European Space Agency and the Canadian Space Agency. The telescope is named after James E. Webb, who served as NASA administrator from 1961 to 1968 and was instrumental in the Apollo program. JWST’s primary mirror, the Optical Telescope Element, consists of 18 hexagonal mirror
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The anion (negatively charged ion) Cl is the anion (chloride ion). It is generated when the element chlorine (a halogen) gets an electron or when a molecule such as hydrogen chloride is dissolved in water or other polar solvents. Chloride compounds like sodium chloride are frequently extremely soluble in water. [4] It is an electrolyte
4 velocity is a four-vector whose elements are given by the contravariant expression {\displaystyle U^{\mu }={\frac {dx^{\mu }}{d\tau }}} where {\displaystyle \tau } is the proper time. For special relativity an inertial frame observer finds the proper time from his own coordinate time {\displaystyle t} and the coordinate speed {\displaystyle u} of the thing being observed by {\displaystyle dt={\frac {d\tau }{\sqrt {1-{\frac {u^{2}}{c^{2}}}}}}=\gamma d\tau
Hydrogen is the chemical element with the symbol H and atomic number 1. Hydrogen is the lightest element. At standard conditions hydrogen is a gas of diatomic molecules having the formula H2. It is colorless, odorless, non-toxic, and highly combustible. Hydrogen is the most abundant chemical substance in the universe, constituting roughly 75% of all
Oxygen is the chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. Oxygen is Earth’s most abundant element, and after hydrogen and helium, it is the third-most abundant element in the universe.
An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across. They are so small that accurately predicting their behavior using classical physics—as if they were tennis balls, for example—is not possible due to quantum effects.
The Sun is the central star of the Solar System. It is a nearly perfect ball of hot plasma that has been heated to incandescence by nuclear fusion processes in its center and radiates energy mostly as visible light, ultraviolet light, and infrared radiation. It is by far the most essential source of energy for
Zinc is a chemical element with the atomic number 30 and the symbol Zn. At room temperature, zinc is a somewhat brittle metal with a silvery-greyish look when oxidation is eliminated. It is the first element in periodic table group 12 (IIB). Zinc is chemically similar to magnesium in various ways: both metals have just