Francium
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Francium is the rarest naturally occurring element, with only about 20-30 grams existing on Earth at any given time. It is the second rarest naturally occurring element and the most unstable, with no stable isotopes. Francium is a highly radioactive alkali metal that decays within minutes. Due to its radioactivity and rarity, little is known about its properties and it has no practical uses.
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The document lists 28 different species of wildflowers found in California and the western United States, including California poppy, lupine, paintbrush, columbine, fuchsia, and others. It provides both the common and scientific name for each flower.
Trees
This document lists 27 tree species found in the Minarets Natural Resources Team area. It includes both common and scientific names for each species. Some of the tree species listed are white fir, California box-elder, red alder, Pacific madrone, incense cedar, Pacific dogwood, Oregon ash, California black walnut, western juniper, lodgepole pine, sugar pine, ponderosa pine, foothill pine, California sycamore, Fremont cottonwood, quaking aspen, Douglas fir, canyon live oak, blue oak, California black oak, valley oak, Pacific willow, blue elderberry, coast redwood, giant sequoia, California bay laurel,
Mammals
This document lists the scientific names of various mammal species found in North America, including the pronghorn antelope, blue whale, coyote, tule elk, Virginia opossum, sea otter, porcupine, mountain lion, black-tailed rabbit, bobcat, northern river otter, yellow-bellied marmot, American marten, humpback whale, striped skunk, black-tailed deer, killer whale, bighorn sheep, raccoon, western gray squirrel, California ground squirrel, cottontail, yellow-pine chipmunk, American badger, bottlenose dolphin, gray fox, kit fox, and California sea lion.
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Francium
- 1. Francium By Ciera Johnson
- 2. Basic Information • Atomic Symbol: Fr • Atomic Number: 87 • Protons: 87 • Electrons: 87 • Neutrons: 136 • Average Atomic Mass: 223
- 3. Continued • Group in periodic table: 1 • Group name: Alkali metal • Period in periodic table: 7 • Melting point: 27.2ºC (80.96ºF) • Boiling point: 677ºC (1,250.6ºF) • It is so radioactive and hard to work with, there is not much known about Francium. • It also has no uses because it is so radioactive.
- 4. Interesting Information • The second rarest naturally occurring element. • It was the last element discovered in nature, that isn’t synthesis. • The most unstable of the naturally occurring elements • As little as 20–30 g (one ounce) exists at any given time throughout the Earth’s crust.
- 5. Discovery • Francium (Eka-caesium) was discovered in 1939 by Marguerite Perey of the Curie Institute in Paris, France • This element existence was predicted by Mendeleev during the 1870's, he called it eka-caesium.
- 6. Isotopes • There are 34 identified Francium isotopes. • There are no stable isotopes of Francium. • Francium-223 is the most stable isotope with a half-life of 21.8 minutes • The least stable ground state isotope is francium-215, with a half-life of 0.12 "s. • All isotopes of Francium decay into either astatine, radium, or radon.
- 7. Atomic Structure. • 7 Energy Levels • 1st: 2 • 4th: 32 • 2nd: 8 • 5th: 18 • 3rd: 18 • 6th: 8 • 7th: 1
- 8. Courses Cited • http://en.wikipedia.org/w/index.php? title=Francium&printable=yes • http://www.andyscouse.com/pages/francium.htm • http://www.chemicalelements.com/elements/ fr.html • http://www.aip.org/history/newsletter/fall2004/ strasbourg-photo.htm • http://www.webqc.org/periodictable-Francium- Fr.html • http://www.periodicvideos.com/videos/087.htm
Editor's Notes
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