Lead is a chemical element in the carbon group with symbol Pb (from Latin: plumbum) and atomic number 82. Lead is a soft, malleable poor metal. It is also counted as one of the heavy metals. Metallic lead has a bluish-white color after being freshly cut, but it soon tarnishes to a dull grayish color when exposed to air. Lead has a shiny chrome-silver luster when it is melted into a liquid.
Lead is used in building construction, lead-acid batteries, bullets and shot, weights, as part of solders, pewters, fusible alloys, and as a radiation shield. Lead has the highest atomic number of all of the stable elements, although the next higher element, bismuth, has a half-life that is so long (much longer than the age of the universe) that it can be considered stable. Its four stable isotopes have 82 protons, a magic number in the nuclear shell model of atomic nuclei.
Lead, at certain contact degrees, is a poisonous substance to animals, including humans. It damages the nervous system and causes brain disorders. Excessive lead also causes blood disorders in mammals. Like the element mercury, another heavy metal, lead is a neurotoxin that accumulates both in soft tissues and the bones. Lead poisoning has been documented from ancient Rome, ancient Greece, and ancient China.
Other articles related to "lead":
... yellow pigments such as the cadmium sulfides and the lead/strontium/barium chromates ... Unlike lead chromate+lead sulfate lemon, bismuth vanadate does not readily blacken with UV exposure ...
... By 1795 the former Templar mills were being used for preparing lead ... Sheets of lead were placed in clay pots and submerged in urine, then heated by decaying cow dung ... The process converted the lead to lead oxide, and it was then finely ground to form a pigment for white, yellow and red lead paint ...
... In the human body, lead inhibits porphobilinogen synthase and ferrochelatase, preventing both porphobilinogen formation and the incorporation of iron into protoporphyrin IX, the final step in heme synthesis ... Acute lead poisoning is treated using disodium calcium edetate the calcium chelate of the disodium salt of ethylene-diamine-tetracetic acid (EDTA) ... This chelating agent has a greater affinity for lead than for calcium and so the lead chelate is formed by exchange ...
... The Beatles John Lennon – lead, harmony and backing vocals, rhythm and acoustic guitars, piano, harmonica, tambourine, handclaps 12-string lead ...
... The Lead has to communicate the direction of the movement to the Follow ... Traditionally, the Lead's right hand on the follow's back, near the lowest part of the shoulder-blade ... This is the strongest part of the back and the lead can easily pull the Follow's body inwards ...
Famous quotes containing the word lead:
“If strange men come from the house
To lead her away do not say
That she is happy being crazy;
Lead gently astray;
Let her finish her dance,
Let her finish her dance.”
—William Butler Yeats (18651939)
“Boys and bad hunters had known what to do
With stone and lead to unprotected glass:
Shatter it inward on the unswept floors.”
—Robert Frost (18741963)
“My Vanquisher, spoild of his vanted spoile;
Death his deaths wound shall then receive, & stoop
*nglorious, of his mortall sting disarmd.
I through the ample Air in Triumph high
Shall lead Hell Captive maugre Hell, and show
The powers of darkness bound. Thou at the sight
Pleasd, out of Heaven shalt look down and smile,”
—John Milton (16081674)