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  2. Permanent Labor Certification - Wikipedia

    en.wikipedia.org/wiki/Permanent_Labor_Certification

    The first part of the Permanent Labor Certification is the Prevailing Wage Determination (PWD). Before the labor market can be tested to see whether any U.S. workers are willing and qualified to work in a given position for which a foreign citizen is being sponsored, the Department of Labor is required to determine what the average prevailing U.S. wage for that position is.

  3. Labor Condition Application - Wikipedia

    en.wikipedia.org/wiki/Labor_Condition_Application

    Labor Condition Application. The Labor Condition Application (LCA) is an application filed by prospective employers on behalf of workers applying for work authorization for the non-immigrant statuses H-1B, H-1B1 (a variant of H-1B for people from Singapore and Chile) and E-3 (a variant of H-1B for workers from Australia).

  4. Hückel's rule - Wikipedia

    en.wikipedia.org/wiki/Hückel's_rule

    The (4n+2) rule is a consequence of the degeneracy of the π orbitals in cyclic conjugated hydrocarbon molecules. As predicted by Hückel molecular orbital theory, the lowest π orbital in such molecules is non-degenerate and the higher orbitals form degenerate pairs. Benzene's lowest π orbital is non-degenerate and can hold 2 electrons, and ...

  5. 4N - Wikipedia

    en.wikipedia.org/wiki/4N

    Hückel's rule, 4n + 2 rule; Singly even number, a number of the form 4n + 2; A-4N, a model of Douglas A-4 Skyhawk; AD-4N, a model of Douglas A-1 Skyraider; RQ-4N, a model of Northrop Grumman RQ-4 Global Hawk; F-4N Phantom II, see List of McDonnell Douglas F-4 Phantom II variants; F7F-4N, a model of Grumman F7F Tigercat; F4N, a model of Vought ...

  6. Group 4 element - Wikipedia

    en.wikipedia.org/wiki/Group_4_element

    Group 4 is the second group of transition metals in the periodic table. It contains only the four elements titanium (Ti), zirconium (Zr), hafnium (Hf), and rutherfordium (Rf). ). The group is also called the titanium group or titanium family after its lightest me

  7. List of McDonnell Douglas F-4 Phantom II variants - Wikipedia

    en.wikipedia.org/wiki/List_of_McDonnell_Douglas...

    A U.S. Marine Corps F-4N aboard Coral Sea, 1980. F-4N F-4B modernized under project Bee Line, the same aerodynamic improvements as F-4J, smokeless engines. First flight 4 June 1972; 228 converted. QF-4N F-4Ns converted into remote-controlled supersonic target drones. F-4S

  8. Woodward–Hoffmann rules - Wikipedia

    en.wikipedia.org/wiki/Woodward–Hoffmann_rules

    Thermolysis converts 1 to (E,E) geometric isomer 2, but 3 to (E,Z) isomer 4.. The Woodward–Hoffmann rules (or the pericyclic selection rules) [1] are a set of rules devised by Robert Burns Woodward and Roald Hoffmann to rationalize or predict certain aspects of the stereochemistry and activation energy of pericyclic reactions, an important class of reactions in organic chemistry.

  9. 4n + 2 - Wikipedia

    en.wikipedia.org/wiki/4n_+_2

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