1 The national average price of gas in December was $2.51 per gallon, which was the lowest monthly average since May 2009. 2  The average in December 2013 was $3.26 per gallon. 3  Consumers this month spent about $215 million per day less on gasoline compared to December 2013. The annual average price of gasoline in 2014 was $3.34 per gallon, which was about 15 cents less than last yearâs annual average of $3.49 per gallon.
A sulfide formed with tin and antimony is called franckeite. Lead is found in the mineral nagyagite, a sulfide, along with gold, iron, antimony, and tellurium. Silver joins with lead and antimony in the sulfide andorite, AgPbSb3S6. Lead, copper and iron join in the sulfide betekhtinite. In the sulfide mineral hutchinsonite,(Tl, Pb)2As5S9 , lead joins with arsenic and thallium.
The symbol came from the Latin word plumbum, meaning lead: Date and Place of Discovery: Known to the ancients: Discovered by: Unknown: Common Compounds: Lead azide [Pb(N 3) 2] Lead chloride (PbCl 2) Lead chromate (PbCrO 4) Lead hydrogen arsenate (PbHAsO 4) Lead iodide (PbI 2) Lead nitrate [Pb(NO 3) 2] Lead oxide (PbO 2) Lead selenide (PbSe) Lead sulfate (PbSO 4) Lead sulfide (PbS) Lead telluride (PbTe) Interesting facts: It does not occur in nature in large amounts. It is usually found in zinc, silver and copper ores. Galena contains about 86.6% of lead. The greatest source of lead today is in recycling automobile batteries. It is a soft, heavy, toxic metal that is malleable. It is bluish white when cut but as it is exposed to the air it turns a dull gray. It has the highest atomic number of all the stable elements. It is a neurotoxin that accumulates in soft tissues and bone. It is not a good conductor of electricity.