IRON: The actual date when iron was
discovered is not known. However, iron
can date back to 3000 B.C. We know this
because artifacts of iron were found.
Also, an iron pillar from India can be dated back to 400 A.D.
POTASSIUM: Back in the day, Potassium was thought of as
Sodium. People did not know that there
were in fact two elements, not one. Sir
Humphry Davy, of England, discovered Potassium through the process of electrolysis. Potassium was the first metal, ever, to be
isolated through the process of electrolysis.
NITROGEN: Unlike iron, we know when nitrogen
was found. The year was 1772 and the man
was Daniel Rutherford from Scotland.
Their lead on nitrogen was from another gas, oxygen. They knew that oxygen had another gas,
Nitrogen.
URANIUM: Uranium can date back to 79 A.D.
Martin Klaproth discovered it in Germany in the year of 1789. He named it Uranium after the recently
discovered planet, Uranus. Uranium metal
wasn’t isolated until 1841 by Eugene - Melchoir Peligot. Henri Becquerel in 1896 discovered its
radioactivity.
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