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Lead is a chemical element with the symbol Pb (from the Latin plumbum) and atomic number 82. It is a heavy metal that is denser than most common materials. Lead is soft and malleable, and also has a relatively low melting point.
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| Lead | |
|---|---|
| Mohs hardness | 1.5 |
| Brinell hardness | 38–50 MPa |
| CAS Number | 7439-92-1 |
| History | |
- What is lead made of?
- What chemicals are found in lead?
- What's the chemical formula for lead?
- What mineral is lead?
- Is lead a rock or mineral?
- What are 5 Chemical Properties lead?
- Are lead compounds harmful?
- Are all lead compounds toxic?
- Is lead ionic or covalent?
- How is lead made naturally?
- Why is lead so heavy?
- Where is lead most commonly found?
- What is lead production?
- What ore is lead found in?
- What is lead zinc used for?
- Is lead mined?
What is lead made of?
We're not in the habit of crushing dreams, but we have to break it to you: pencils do not contain lead. Instead, the pencil material is actually graphite. Plumbago pencil lead, to be exact. To get all geologist on you, plumbago is a naturally-occurring crystalline form of carbon arranged in a hexagonal structure.
What chemicals are found in lead?
Lead shows oxidation states of +2 and +4 in its compounds. Among the many important lead compounds are the oxides: lead monoxide, PbO, in which lead is in the +2 state; lead dioxide, PbO2, in which lead is in the +4 state; and trilead tetroxide, Pb3O4.
What's the chemical formula for lead?
Lead Metal is an element with atomic symbol Pb, atomic number 82, and atomic weight 207.2. Lead(0) is an elemental lead. It has a role as a neurotoxin.
What mineral is lead?
Lead is a soft, malleable, ductile and dense metallic element. It is extracted chiefly from the mineral galena and found in ore that also contains zinc, silver and copper. The chemical properties of lead allow this element to be used in power storage and delivery applications.
Is lead a rock or mineral?
Lead (element #82, symbol Pb) is a very soft, blue-gray, metallic element. It is primarily produced from the mineral galena.
What are 5 Chemical Properties lead?
Its properties include a low melting point; ease of casting; high density; low strength; ease of fabrication; acid resistance; electrochemical reaction with sulfuric acid; chemical stability in air, water, and soils; and the ability to attenuate sound waves, atomic radiation, and mechanical vibration (11).
Are lead compounds harmful?
Exposure to high amounts of lead can cause gastrointestinal symptoms, severely damage the brain and kidneys, and may cause reproductive effects. Large doses of some lead compounds have caused cancer in lab animals.
Are all lead compounds toxic?
The most toxic group comprises ionic lead, colloidal lead hydroxide, metallic lead, glycerophosphate, oleate and stearate. The lead hydroxide and glycerophosphate are quite soluble. The metallic lead oxidizes to the hydroxide in the blood stream. All these compounds function potentially as ionic lead.
Is lead ionic or covalent?
Lead is a relatively unreactive post-transition metal. Its weak metallic character is illustrated by its amphoteric nature; lead and lead oxides react with acids and bases, and it tends to form covalent bonds.
How is lead made naturally?
Natural formation of lead occurs by radioactive decay of uranium and thorium through radon (222Rn). Four stable isotopes are known, 204Pb, 206Pb, 207Pb and 208Pb, the first three of which are used for estimating the ages of rocks. Lead compounds exist mainly in +2 or +4 oxidation states, the former being more common.
Why is lead so heavy?
Lead is a stable metal that's often used as weights and sinkers. The reason it's heavy in terms of mass per unit volume (or think about it as per teaspoon), is because the lead atoms are very close, making it a dense material.
Where is lead most commonly found?
Lead can be found in all parts of our environment – the air, the soil, the water, and even inside our homes. Much of our exposure comes from human activities including the use of fossil fuels including past use of leaded gasoline, some types of industrial facilities and past use of lead-based paint in homes.
What is lead production?
Plants for the production of lead are generally referred to as lead smelters. Primary lead production begins with sintering. ... Lead is usually smelted in a blast furnace, using the lead sinter produced in the sintering process and coke to provide the heat source. As melting occurs, several layers form in the furnace.
What ore is lead found in?
Types of lead ore
Lead ore is most commonly found as lead sulphide (PbS), galena, a heavy, shiny grey metallic ore with a conspicuous cubic cleavage, but locally pyromorphite, lead chlorophosphate (Pb5(PO4)3Cl), was worked on Green Hill, near Charterhouse and on Blagdon Hill.
What is lead zinc used for?
About 50% of production is used for galvanising steel to protect it from rust. Zinc compounds and dusts are used in cosmetics, plastics, rubber, ointments, sun screen creams, soaps, paints, ink, fertilisers and batteries.
Is lead mined?
minerals commercially mined for lead are cerussite and anglesite. ... Therefore much lead ore is obtained as a byproduct of other metal mining, usually zinc or silver. Only half of all lead used yearly derives from mining, as half is recovered through recycling, mostly of automobile batteries.
