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Lanthanum is a chemical element with the symbol La and the atomic number 57. It is a soft , ductile , silvery-white metal that tarnishes slowly when exposed to air. It is the eponym of the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table , of which lanthanum is the first and the prototype.
57 La 2-1 - 58 Ce 2 1 1 - 59 Pr 2 3-- 60 Nd 2 4-- 61 Pm 2 5-- 62 Sm 2 6-- 63 Eu 2 7-- 64 Gd 2 7 1 ... Note that these electron configurations are given for neutral ...
The Lahey Hospital & Medical Center, formerly known as the Lahey Clinic, is a physician-led nonprofit teaching hospital of UMass Chan Medical School based in Burlington, Massachusetts. The hospital was founded in Boston in 1923 by surgeon Frank H. Lahey, M.D., [1] [2] and is managed by Beth Israel Lahey Health.
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Here [Ne] refers to the core electrons which are the same as for the element neon (Ne), the last noble gas before phosphorus in the periodic table. The valence electrons (here 3s 2 3p 3) are written explicitly for all atoms. Electron configurations of elements beyond hassium (element 108) have never been measured; predictions are used below.
In 2018, Massachusetts Eye and Ear had two adult specialties nationally ranked the "U.S. News Best Hospitals Rankings and Ratings 2018-18, with the Department of Ophthalmology ranked number four in the U.S. and the Department of Otolaryngology placing number six in the nation. [3]
An example of the Landolt C eye chart (also known as the Japanese eye chart). Numerous types of eye charts exist and are used in various situations. For example, the Snellen chart is designed for use at 6 meters or 20 feet, and is thus appropriate for testing distance vision, while the ETDRS chart is designed for use at 4 meters. [16]
Mobileye's Road Experience Management, or REM, uses real-time data from Mobileye-equipped vehicles to maintain its 3D maps. [57] The data collected amounts to about 10 kilobytes per kilometer. [27] It is compiled in a map called Mobileye RoadBook that leverages anonymized, crowdsourced data from vehicle cameras for navigation and localization. [58]