Answer:
1735 to 1745. Cobalt (Brandt ~1735)
1735 to 1745. Cobalt (Brandt ~1735) 1745 to 1755. Nickel (Cronstedt 1751)
1735 to 1745. Cobalt (Brandt ~1735) 1745 to 1755. Nickel (Cronstedt 1751) 1755 to 1765. No new elements discovered in this date range
1735 to 1745. Cobalt (Brandt ~1735) 1745 to 1755. Nickel (Cronstedt 1751) 1755 to 1765. No new elements discovered in this date range1765 to 1775. Hydrogen (Henry Cavendish 1766)
1735 to 1745. Cobalt (Brandt ~1735) 1745 to 1755. Nickel (Cronstedt 1751) 1755 to 1765. No new elements discovered in this date range1765 to 1775. Hydrogen (Henry Cavendish 1766) 1775 to 1785. Molybdenum (Scheele 1778)