SANTIAGO, May 17 (Reuters) - Chile’s stock exchange plunged more than 5% in early trading on Monday as the market recoiled following a shock election in which the ruling center-right coalition failed to secure a critical one-third of seats in the body that will draft the new constitution. (Reporting by Fabian Cambero; Writing by Dave Sherwood; Editing by Andrew Heavens) Our Standards: The Thomson Reuters Trust Principles.