Uses

Palladium is very rare, although it is found in platinum, silver, gold, and copper and is normally found after mining these metals. Palladium has many uses. This metal is used for dentistry, like dental fillings and crowns for cavities. Palladium is also used for springs in watches, aircraft spark plugs, surgical tools, signs, and before better drugs were invented, was used as a perspiration for tuberculosis. One interesting thing that palladium is used for is catalytic converters and anything with an engine. Palladium is also used in jewelry like in white gold. One of the major objects that palladium is used for is Chinese coin money. There is also a company that sells boots called Palladium Boots, but don't be fooled there is no actual palladium in the boots. 

History

Palladium was discovered in the year 1803 in London, England by William H. Wollaston. Mr. Wollaston was observing and analyzing samples of platinum ore when he had came across the rare element. Wollaston separated the palladium from the platinum by dissolving the platinum in aqua regia. There was an asteroid that had was found the March before the discovery names Pallas and Mr. Wollaston decided to name this metal after the asteroid. He tried to keep his findings and techniques a secret for as long as he could. His colleagues also had no idea what he was up to, thinking that the palladium was only an alloy of platinum, but soon become suspicious. After realizing that people were catching on to what he was doing Wollaston was forced to release his information in 1805. ​

Valuableness 

Palladium is one of the cheapest metals pricing in at %15.00 per 100 grams which is $0.75 less than aluminum. Although palladium isn't worth much it is used in lots of essential materials listed above.  

Interesting facts

Palladium doesn't react with oxygen which means it doesn't get tarnished when exposed to the air. Palladium is also the least dense metal and has the lowest melting point of all the platinum metals. This metal also, when bonded with hydrogen, will sometimes fill up and expand like a sponge filled with water, or create a flame as shown in this video: https://www.youtube.com/watch?v=I45xfo-JvTk . 

Bibliography

"#46 -Palladium - Pd." #46 -Palladium - Pd. N.p., n.d. Web. 29 Oct. 2015.

"The Element Palladium." It's Elemental -. N.p., n.d. Web. 29 Oct. 2015.

"History of Palladium - Bullion.com." History of Palladium - Bullion.com. N.p., n.d. Web. 29 Oct. 2015.

Gray, Theodore W., and Nick Mann. The Elements: A Visual Exploration of Every Known Atom in the Universe. New York: Black Dog & Leventhal, 2012. Print.

"Periodic Tales: A Cultural History of the Elements, from Arsenic to Zinc Reprint Edition." Periodic Tales: A Cultural History of the Elements, from Arsenic to Zinc: Hugh Aldersey-Williams: 9780061824739: Amazon.com: Books. N.p., n.d. Web. 29 Oct. 2015.

See Some Examples