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Astat (At) - Properties
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Astat (At) - Properties

Atomic mass, symbol and atomic number Astat is a naturally occurring element with the element symbol At and atomic number 85. In the periodic table it stands with an atomic mass of 209.987 u in the 7th main group. The chemical element discovered by Corson, MacKenzie and Segrè in 1940 is radioactive and is in a solid state of aggregation at room temperature.

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Anion

What is an anion? Definition: Anion (ancient Greek ana = up, ion = migratory) is the term for an electrically negatively charged ion. The name is derived from the direction in which negatively charged ions move during electrolysis: up to the anode. An anion can arise from a neutrally charged atom by taking up one or more electrons.
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Active immunization

Definition: Active Immunization (Active Vaccination) is the classic vaccine containing a vaccine containing antigens. A live vaccine (severely attenuated pathogen) or a dead vaccine (killed pathogen) is administered intramuscularly (in the muscle), subcutaneously (tissue under the skin), or as a vaccine and induces an immune response.
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Physical state

What is an aggregate state? Definition and explanation ... The state of aggregation describes the pressure and temperature-dependent state of a chemical substance. The three classical aggregate states solid, liquid and gaseous show physical properties which are typical for the respective state of aggregation with regard to particle movement or particle spacing.
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Astat (At) - Properties

Atomic mass, symbol and atomic number Astat is a naturally occurring element with the element symbol At and atomic number 85. In the periodic table it stands with an atomic mass of 209.987 u in the 7th main group. The chemical element discovered by Corson, MacKenzie and Segrè in 1940 is radioactive and is in a solid state of aggregation at room temperature.
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Americium (Am) - Properties

Atomic mass, symbol and atomic number Americium is an artificially created element with the element symbol Am and atomic number 95. In the periodic table it belongs to the actinoids with an atomic mass of 243.061 u. The chemical element discovered by Glenn T. Seaborg in 1944 is radioactive and is in a solid state of aggregation at room temperature.
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Agate

Profile: Name: Agate Other names: Agate, onyx Mineral class: oxides and hydroxides Chemical formula: SiO 2 Chemical elements: silicon, oxygen Similar minerals: / Color: multicolored (eg brown, yellow, red, black) Gloss: Glass luster crystal structure: trigonal mass density: 2.8 magnetism:?
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Aquamarine

Wanted: Name: Aquamarine Other Names: Beryll Mineral class: silicates and germanates Chemical formula: Be 3 Al 2 (SiO 3) 6 Chemical elements: beryllium, aluminum, silicon, oxygen Similar minerals: see beryl Color: white-blue Luster: glossy glass Crystal structure : hexagonal mass density: approx.
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Old Stone Age

The Paleolithic ... The Paleolithic or Paleolithic describes the earliest phase of human prehistory and human development and began about 2.6 million years before Christ's birth. Scientists define the beginning of the Paleolithic Age, which also marks the first phase of the Stone Age, through the ability of man to use stones as tools for different purposes.
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Bacterial cell

Structure and function of cell organelles in bacterial cells The bacterial cell belongs to the prokaryotes with the archaea. Structure of a bacterial cell Bacteria chromosome: The bacterial chromosome is a self-contained and up to 1.5mm long DNA molecule. Since bacteria have no nucleus, their DNA floats freely in the cytoplasm of the bacterial cell.
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Fertilization

Definition: Fertilization (lat. Fertilitas = fertility) or fertilization, the union of sperm cell and egg cell is called, while consequence the zygote arises. Due to the fusion of the cell nuclei of both germ cells, the zygote now has a complete, diploid set of chromosomes, with a total of 46 chromosomes (only in humans!
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Basalt

Wanted: Name: Basalt Other names: / Mineral class: silicates Chemical formula:? Chemical elements: silicon, oxygen, aluminum, iron, calcium, magnesium, potassium, sodium Similar minerals: gabbro Color: gray, black Gloss: matt Crystal structure: / mass density: about 2.5 Magnetism: no Mohs hardness: approx.
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Amber

Wanted: Name: Bernstein Other Names: Succinite, Amber, Electrum Mineral Class: Organic Compounds Chemical Formula: C 10 H 16 O + (H 2 S) Chemical elements: Carbon, Hydrogen, Oxygen, Sulfur Similar minerals: / color : yellow-brown, red, orange, honey yellow gloss: greasy crystal structure: amorphous mass density: approx.
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Biographies

Review Selected biographies on important scientists ... Biology-Schule.de collects biographies of the most famous scientists from all centuries of human history.
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Border collie

Character Title: Border Collie Alternate Names: / Origin: United Kingdom FCI Group: Sheepdogs and Cattle Dogs Size (up to 55cm) Height (): up to 52cm Weight (): 14 - 20kg Weight (): 12 - 18kg Life expectancy: 12 - 15 years Nutrition: Carnivore Sexual maturity: Litter size: 6 - 8 Coat color: black-white, brown Skin type: dense Coat length: medium character / intelligent, dynamic, active, determined Attitude: no housing posture, lots of exercise Border collie - introduction information As an ancestor In the Border Collie shepherd dogs are believed to have already arrived in Great Britain with the Vikings.
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Nettle

Characteristics Name: Stinging nettle Latin name: Urtica Other names: Nettle Plant family: Nettle plant Number of species: approx. 30 species Distribution: worldwide Plant location: nitrogen-rich soils Blades: approx. saftgr—Ćn; with stinging hairs fruits:? Flower color: yellow-brownish Flowering period: June - octopus Height: 1 - 3m Age: yearlong and perennially possible Usage: Medicinal plant Characteristics: improves circulation Information on the plant: stinging nettle Stinging nettles belong to the family of nettle plants and are distributed worldwide.
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Barium (Ba) properties

Atomic mass, symbol and atomic number Barium is a naturally occurring element with the elementary symbol Ba and the atomic number 56. In the periodic table it stands with an atomic mass of 137.327 u in the 7th main group. The chemical element discovered by Wilhelm Scheele in 1774 is not radioactive and is in a solid state of aggregation at room temperature.
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Lead (Pb) properties

Atomic mass, symbol and atomic number Lead is a naturally occurring element with the element symbol Pb and atomic number 82. In the periodic table it stands with an atomic mass of 207.2 u in the 4th main group. The chemical element is not radioactive and is in a solid state at room temperature.
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Bronze age

The Bronze Age ... The Bronze Age describes a phase of early human history that began in Europe around 2300 to 2200 BC and lasted 1400 years. The name of this historical section refers to the ability to use tin and copper alloys in the manufacture of tools, weapons and many other everyday objects.
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Chlorine (Cl) properties

Atomic mass, symbol and atomic number Chlorine is a naturally occurring element with the elementary symbol Cl and the atomic number 17. In the periodic table it stands with an atomic mass of 35.45 u in the 7th main group. The chemical element discovered by Humphry Davy in 1808 is not radioactive and is in a gaseous state at room temperature.
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Cocker spaniel

Character Title: Cocker Spaniel Alternative Names: English Cocker Spaniel Original Origin: United Kingdom FCI Group: Retrievers, Flushing Dogs, Water Dogs Size (up to 40cm) Height (): up to 36cm Weight (): 11 - 14kg Weight (): 10 - 13kg Life expectancy: 10 - 15 years Nutrition: Carnivore Sexual maturity: Litter size: 4 - 6 Coat color: brown, black, red, white, tricolor Skin type: dense, shiny Coat length: long Character / character: open, friendly, loyal, playful Attitude: required A consistent education Akita - Introduction The direct ancestors of the Cocker Spaniel look back on a long history, because coin finds from the fourth century BC already show pictures of similar dogs.
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