0
Oxygen itself was discovered in the 1770s independently by Carl Wilhelm Scheele and Joseph Priestley (Scheele did his experiments earlier than Priestley, but his book describing them wasn't published until a couple of years after Priestly published his work).
Antoine Lavoisier also claimed to have discovered it independently, but it's known that Priestly visited Lavoisier and discussed his experiments and Scheele mailed Lavoisier a description of his experiments prior to the time that Lavoisier published anything. Lavoisier did suggest a better name (oxygen) than either Priestly (dephlogisticated air) or Scheele (fire air), though.
However, the notion that there might even be such a thing as isotopes wasn't suggested until the early 1900s (around 1910-1913).
I can't find an exact date of discovery of oxygen-15 specifically. There's a paper about it available from Science Direct, but I don't feel like paying $42 to find out since I'm not really all that interested (if you are, I've linked the paper in the related links). However, the graph is viewable for free, and it looks like oxygen-15 was discovered around 1932 or 1933 (definitely after 1930, definitely before 1935). If someone is affiliated with an institution with a subscription, please edit this to put in the exact date listed in the paper.
What else can I help you with?
Who discovered carbon 16?
Who discovered carbon and when Who discovered carbon and when
Who discovered money?
Money was not discovered, it was invented.
Hernando cortes' major discovery?
he discovered speggeti he discovered speggeti he discovered speggeti
Who discovered the rhombicosidodecahedron?
The rhombicosidodecahedron was discovered by Archimedes.
Who discovered angles?
Archimedes discovered angles
What is the past tense of discovered?
The past tense of "discovered" is "discovered."
Who discovered Saturn moons?
The first person to discover Saturn`s moons was Christian Huygens in 1655. The following moons discovered in order are: Titan Discovered:1655 Discovered by:Christian Huygens Iapetus Discovered:1671 Discovered by:Giovanni Cassini Rhea Discovered:1672 Discovered by:Giovanni Cassini Tethys Discovered:1684 Discovered by:Giovanni Cassini Dione Discovered:1684 Discovered by:Giovanni Cassini Enceladus Discovered:1789 Discovered by:William Herschel Mimas Discovered:1789 Discovered by:William Herschel Hyperion Discovered:1848 Discovered by:William Lassell Phoebe Discovered:1898 Discovered by:William Pickering Janus Discovered:1965-1966 Discovered by: Audouin Dollfus Epimetheus Discovered:1966 Discovered by:Richard Walker Helene Discovered:1980 Discovered by: Pierre Laques Telesto Discovered:1980 Discovered by:Bradford Smith Calypso Discovered:1980 Discovered by:Dan Pascu Prometheus Discovered:1980 Discovered by:Stewart Collins Pandora Discovered:1980 Discovered by:Stewart Collins Atlas Discovered:1980 Discovered by:Richard Terrile Pan Discovered:1981 Discovered by:Showalter Other astronomers:Kevin Beurile, Brett Gladman, Matthew Holman and others. If you want to see the rest, go to wikipedia.com to see the article Timeline discovery of solar system planets and their moons.
When mural discovered?
The murals were discovered in 1928. The murals were discovered in 1928. The murals were discovered in 1928.
Who discovered carbon 16?
Who discovered carbon and when Who discovered carbon and when
Who was sulfur discovered by and what year was sulfur discovered?
The man that discovered sulfur was Antoine Lavoisier and he discovered it in 1777
Who discovered in the US?
it was discovered at ?
When was the mesosphere discovered?
It was discovered on April 1st 1926.It was discovered by enstein.
When was atherosclerosis discovered?
my neighbor discovered it
Was electricity invented or discovered?
Discovered by Ben then created
Who discovered money?
Money was not discovered, it was invented.
When was the mathematics discovered?
it was never discovered,its like asking who discovered sex
How was Ciara discovered?
i think ciara was discovered by youtube and jazzy pha discovered her
