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Actinium is a chemical element; it has symbol Ac and atomic number 89. It was first isolated by Friedrich Oskar Giesel in 1902, who gave it the name emanium; the element got its name by being wrongly identified with a substance André-Louis Debierne found in 1899 and called actinium.
The actinide series is a group of chemical elements with atomic numbers ranging from 89 to 102, [note 1] including notable elements such as uranium and plutonium.The nuclides (or isotopes) thorium-232, uranium-235, and uranium-238 occur primordially, while trace quantities of actinium, protactinium, neptunium, and plutonium exist as a result of radioactive decay and (in the case of neptunium ...
Santa Barbara County. Butterfly Beach, Santa Barbara, California. Rancho Guadalupe Dunes County Park. Point Sal State Beach. Surf Beach. Jalama Beach County Park. Jack and Laura Dangermond Preserve. Hollister Ranch.
Actinide chemistry. Plutonium is a transuranic radioactive chemical element, an actinide metal. Actinide chemistry (or actinoid chemistry) is one of the main branches of nuclear chemistry that investigates the processes and molecular systems of the actinides. The actinides derive their name from the group 3 element actinium.
In its annual “report card,” Heal the Bay graded more than 700 beaches and found that 94% of California’s beaches logged clean water-quality marks between April and October 2021, and that 51 ...
Actinium-227 (half-life 21.77 years) occurs in all uranium ores, but in small quantities. One gram of uranium (in radioactive equilibrium) contains only 2 × 10 −10 gram of 227 Ac. [30] [57] Actinium-228 is a member of the radioactive thorium series formed by the decay of 228 Ra; [60] it is a β − emitter with a half
California Department of Parks and Recreation. Santa Monica Pier, Route 66 Sign. Santa Monica State Beach is a California State Park operated by the city of Santa Monica. [ 1 ][ 2 ] The beach is located along Pacific Coast Highway. It is 3.5 miles (5.6 km) long and has parks, picnic areas, playgrounds, restrooms, as well as staffed lifeguard ...
Jade Cove is located in the southern area of Big Sur on the California central coast. [1] It contains the only concentrated underwater deposit of quality nephrite jade in the world. [2] Individuals are permitted to collect as much jade as they can personally carry using hand tools up to 90 feet (27 m) deep offshore.