When was the first president of Israel elected?

The first president of Israel was Chaim Weizmann. Weizmann was a Russian born chemist. He was elected on February 1, 1949, and served as president of Israel until his death on November 9, 1952. As a chemist Weizmann developed the ABE-process which produces acetone through bacterial fermentation. He founded the Weizmann Institute of Science in Rehovot, Israel in 1934.