glennn seaborg mcneese 6th By Ms_S_Bradley Apr 19, 1912 glenn seaborg was born Jan 13, 1948 new element americium Jan 21, 1948 new element curium Apr 16, 1950 new element berkelium Jun 5, 1950 new element californium Dec 24, 1951 the transuranium elements Sep 13, 1967 the first weighing of plutonium Feb 15, 1999 glenn seaborg died
