Boron is a chemical element in the periodic table that has the symbol B and atomic number 5. A trivalent metalloid element, boron occurs abundantly in the ore borax. There are several allotropes of boron; amorphous boron is a brown powder, but metallic boron is black. The metallic form is hard (9.3 on Mohs' scale) and a bad conductor in room temperatures. It is never found free in nature. Crystalline boron exists in many polymorphs. Two rhombohedral forms, α-boron and β-boron containing 12 and 106.7 atoms in the rhombohedral ...

Including:

Boron - Notable characteristics Boron - Applications Boron - History Boron - Occurrence Boron - Isotopes
Boron - Depleted boron
Boron - Precautions

Read more here: » Boron: Encyclopedia - Boron

See also:

Boron, Boron - Notable characteristics, Boron - Applications, Boron - History, Boron - Occurrence, Boron - Isotopes, Boron - Depleted boron, Boron - Precautions

Read more here: » Boron: Encyclopedia II - Boron - Applications

Boron is electron-deficient, possessing a vacant p-orbital. It is an electrophile. Compounds of boron often behave as Lewis acids, readily bonding with electron-rich substances in an attempt to quench boron's insatiable hunger for electrons. Optical characteristics of this element include the transmittance of infrared light. At standard temperatures boron is a poor electrical conductor but is a good conductor at high temperatures. Boron nitride can be used to make materials that are almost as hard as diamond. The nitride also a ...

See also:

Boron, Boron - Notable characteristics, Boron - Applications, Boron - History, Boron - Occurrence, Boron - Isotopes, Boron - Depleted boron, Boron - Precautions

Read more here: » Boron: Encyclopedia II - Boron - Notable characteristics

Boron has two naturally-occurring and stable isotopes, 11B (80.1%) and 10B (19.9%). The mass difference results in a wide range of δB-11 values in natural waters, ranging from -16 to +59. There are 13 known isotopes of boron, the shortest-lived isotope is 7B which decays through proton emission and alpha decay. It has a half-life of 3.26500x10-22 s. Isotopic fractionation of boron is controlled by the exchange reactions of the boron species B(OH)3 and B(OH)4. Boron isotopes a ...

See also:

Boron, Boron - Notable characteristics, Boron - Applications, Boron - History, Boron - Occurrence, Boron - Isotopes, Boron - Depleted boron, Boron - Precautions

Read more here: » Boron: Encyclopedia II - Boron - Isotopes

The United States and Turkey are the world's largest producers of boron. Boron does not appear in nature in elemental form but is found combined in borax, boric acid, colemanite, kernite, ulexite and borates. Boric acid is sometimes found in volcanic spring waters. Ulexite is a borate mineral that naturally has properties of fiber optics. Economically important sources are from the ore rasorite (kernite) and tincal (borax ore) which are both found in the Mojave Desert of California (with borax being the most important source there). Turkey is another place where ...

See also:

Boron, Boron - Notable characteristics, Boron - Applications, Boron - History, Boron - Occurrence, Boron - Isotopes, Boron - Depleted boron, Boron - Precautions

Read more here: » Boron: Encyclopedia II - Boron - Occurrence

Compounds of boron (Arabic Buraq from Persian Burah) have been known of for thousands of years. In early Egypt, mummification depended upon an ore known as natron, which contained borates as well as some other common salts. Borax glazes were used in China from 300 AD, and boron compounds were used in glassmaking in ancient Rome. The element was not isolated until 1808 by Sir Humphry Davy, Joseph Louis Gay-Lussac, and Louis Jacques Thénard, to about 50 percent purity. These men did not recognize the substance as an eleme ...

See also:

Boron, Boron - Notable characteristics, Boron - Applications, Boron - History, Boron - Occurrence, Boron - Isotopes, Boron - Depleted boron, Boron - Precautions

Read more here: » Boron: Encyclopedia II - Boron - History

Each of these nutrients are used in a different place for a different essential function. Carbon Carbon is what most of the plant is made of. It forms the backbone of many plant biomolecules, including starches and cellulose. Carbon is fixed through photosynthesis from the carbon dioxide in the air and is a part of the carbohydrates that store energy in the plant. Hydrogen Hydrogen also is necessary for building sugars and building the plant. It is obtained from air and ...

See also:

Plant nutrition, Plant nutrition - Plant uses for essential nutrients

Read more here: » Plant nutrition: Encyclopedia II - Plant nutrition - Plant uses for essential nutrients

Cultivation; Spade Fork Hoe Trowel Kirpi Lawncare Lawnmower Pruning and tree care; Secatuers Pruning saw Bow saw ...

See also:

List of organic gardening and farming topics, List of organic gardening and farming topics - Soil, List of organic gardening and farming topics - Soil fertility, List of organic gardening and farming topics - Techniques, List of organic gardening and farming topics - Tools, List of organic gardening and farming topics - Propagation, List of organic gardening and farming topics - Wildlife in the garden, List of organic gardening and farming topics - Crops, List of organic gardening and farming topics - The ornamental organic garden, List of organic gardening and farming topics - Pests and diseases, List of organic gardening and farming topics - Weeds, List of organic gardening and farming topics - Organic organisations, List of organic gardening and farming topics - Some important figures in the organic gardening movement, List of organic gardening and farming topics - Related lists

Read more here: » List of organic gardening and farming topics: Encyclopedia II - List of organic gardening and farming topics - Tools

Cultivation; Spade Fork Hoe Trowel Kirpi Lawncare Lawnmower Pruning and tree care; Secatuers Pruning saw Bow saw ...

See also:

List of organic gardening and farming topics, List of organic gardening and farming topics - Soil, List of organic gardening and farming topics - Soil fertility, List of organic gardening and farming topics - Techniques, List of organic gardening and farming topics - Tools, List of organic gardening and farming topics - Propagation, List of organic gardening and farming topics - Wildlife in the garden, List of organic gardening and farming topics - Crops, List of organic gardening and farming topics - Organic farming and gardening systems and approaches, List of organic gardening and farming topics - The ornamental organic garden, List of organic gardening and farming topics - Pests and diseases, List of organic gardening and farming topics - Weeds, List of organic gardening and farming topics - Organic organisations, List of organic gardening and farming topics - Some important figures in organic farming and gardening, List of organic gardening and farming topics - Related lists

Read more here: » List of organic gardening and farming topics: Encyclopedia II - List of organic gardening and farming topics - Tools