Bell Atlantic Corp. has elected William L. Mobraaten chairman of Bell Atlantic Enterprises Corp., the company's non-telephone subsidiary. Since the breakup of the Bell system in January 1984, the subsidiary has played an increasingly important role in the regional phone company. Mobraaten, formerly chief financial officer of Bell Atlantic, will remain a vice chairman of the parent company and a member of its board of directors. Pennsylvania Bell President and Chief Executive Officer Raymond W. Smith will replace Mobraaten in Bell Atlantic's top financial and public policy-making position. Gilbert A. Wetzel, currently vice president of external affairs at Bell of Pennsylvania, will succeed Smith.

American Satellite Co., a joint venture between Fairchild Industries Inc. and Continental Telecom Inc., has appointed John R. Colbert as senior vice president and chief financial officer and Dennis S. Mesko as vice president for human resources, both new positions at the Rockville firm. Colbert had been treasurer of M/A Com Inc., and earlier, a director of Prime Computer Corp. Mesko was formerly director of human resources for Black & Decker Manufacturing Co.'s household products division.

Jeanne Campbell, formerly vice president of the New England Council, and Craig Raupe, previously administrative assistant to House Majority Leader James C. Wright Jr. (D-Tex.), have formed the new government relations and public affairs firm of Campbell-Raupe Associates Inc.

Two Washington public affairs consultants, Joseph E. McMahon and Roy O. Harris Jr., have formed a new firm, McMahon & Harris Co. McMahon, an attorney, was business director of President Reagan's 1980 election campaign, while Harris is a former account executive with Hill & Knowlton Inc. Douglas A. Durante and Sandra A. Schlicker were named associates of the firm.