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Ar (11.2%) by electron capture or positron emission, and also to stable 40 Ca (88.8%) by beta decay. These properties and ratios are used to determine the age of rocks by K–Ar dating. [25] [26] In Earth's atmosphere, 39 Ar is made by cosmic ray activity, primarily by neutron capture of 40 Ar followed by two-neutron emission.
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However there are numerous exceptions; for example the lightest exception is chromium, which would be predicted to have the configuration 1s 2 2s 2 2p 6 3s 2 3p 6 3d 4 4s 2, written as [Ar] 3d 4 4s 2, but whose actual configuration given in the table below is [Ar] 3d 5 4s 1.
Arkansas Highway 11 (AR 11) is a designation for four state highways in Arkansas. One segment of 9.57 miles (15.40 km) runs from U.S. Route 63 (US 63) at Pansy north to US 425 south of Star City. A second segment of 22.42 miles (36.08 km) runs from US 425 in Star City north to Huff's Island Public Use Area.
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A smaller version of the AR-10 and adopted by the United States military as the M16 rifle. Later developed by Colt into a popular semi-automatic Colt AR-15. AR-16: 7.62×51mm NATO: ArmaLite: Prototype battle rifle. ArmaLite AR-17: 12 gauge: Semiautomatic 12ga 2shot shotgun based on the earlier AR-9. AR-18: 5.56×45mm NATO