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Among main group (groups 1, 2, 13–17) alkyl derivatives QR n, where n is the standard bonding number for Q (see lambda convention), the group 14 derivatives QR 4 are notable in being electron-precise: they are neither electron-deficient (having fewer electrons than an octet and tending to be Lewis acidic at Q and usually existing as ...
In 2002, Columns III was one of the first Sega titles launched under Sega's short-lived agreement with the RealOne Arcade download service. [2] The Mega Drive version was released on the Wii's Virtual Console download service in Japan on December 11, 2007, in North America on February 4, 2008, and, for the first time in PAL territories, in Europe and Australia on May 2 of the same year.