Daily Archives: January 17, 2017

This is a chunk of pure praseodymium metal under a protective argon atmosphere. Praseodymium is a soft silvery metal that develops a green oxide coating that spalls off when exposed to air. Tomihahndorf
Element Name: Praseodymium Atomic Number: 59 Symbol: Pr Atomic Weight: 140.90765 Element Classification: Rare Earth Element (Lanthanide Series) Discoverer: C.F. Aver von Weisbach Discovery Date: 1885 (Austria) Name Origin: Greek: prasios and didymos (green twin); from its green salts Density (g/cc): 6.773 Melting Point: 1204 K Boiling Point: 3785 K […]

Praseodymium Facts – Element 59 or Pr

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This is the 2013 hybrid solar eclipse, viewed in Uganda on November 3, 2013. A hybrid solar eclipse includes an annular eclipse and a total solar eclipse. This rare event only occurs once about every 160 years. (Anne Helmenstine)
Have you ever heard of the element named coronium or newtonium? Coronium is the name given to an element that 19th century scientists believed might exist in the corona of the Sun. Researchers observed an unidentifiable green line in the spectra of the solar corona, which is visible during a […]

The Element Coronium and the Sun

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Astronauts report the Moon smells like burnt gunpowder. (NASA)
Have you ever wondered what the Moon smells like? Astronauts describe a characteristic scent to the Moon rock and dust. Can you guess what it was? Answer: Astronauts describe the Moon as smelling like burnt gunpowder. In fact, according to Apollo 16 pilot Charlie Duke, it even tasted like burnt […]

What Does the Moon Smell Like?

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