History does not record that information. Weed has doubtlessly been known for thousands of years.
Iodine
Helium was discovered in 1895 by William Ramsay.
Bismuth was discovered around the year 1400.
it was known by the ancients but the year is not specified
1918
Since normal weed was discovered.
since the colonist discovered it in America
It was first discovered and used in centeral and southern asia, in china (of course)
mickey mouse year:1995
yttrium was discovered in the year 1794.
Iodine
a lot
In the year 1902. Dr. Still discovered ADHD.
It was discovered in 1866.
it was discovered 1347
ATOMIC NUMBER YEAR IN WHICH IT WAS DISCOVERED? it was discovered in 1913 by British physicist Henry Mosely
argon was discovered by Dr.william Ramsay of Scotland in the year 1894.