“A chemical element, symbol N, atomic number 7, atomic weight 14.0067; it is a gas, diatomic (N2) under normal conditions; about 78% of the atmosphere is N2; in the combined form the element is a constituent of all proteins.”
The Scottish physicist, chemist and botanist Daniel Rutherford isolated nitrogen in 1772. In his 1772 dissertation, he acknowledged the discovery of a new gas but he did not include specific details of the experiments he had conducted. This is what was mentioned in his dissertation about the isolation of nitrogen:
- He first removed oxygen from a closed container by first using a mouse, then a candle, and finally by burning phosphorus.
- The remaining air (which contained carbon dioxide) was passed through lime-water which resulted in a milky solution as the carbon dioxide reacted with the lime-water.
- What then remained in the air was largely composed of nitrogen.
Here is a portrait of Daniel Rutherford:
[ux_image_box img=”896″ image_width=”40″ link=”https://artuk.org/discover/artworks/daniel-rutherford-17491819-186075/search/collection:royal-college-of-physicians-of-edinburgh-2422/page/5/sort_by/object.lifecycle.creation.date.earliest/order/asc/view_as/grid” target=”_blank”]
- https://books.google.de/books?id= JxUUAAAAQAAJ&source=gbs_navlinks_s
- https://artuk.org/discover/artworks/ daniel-rutherford-17491819-186075/search/collection:royal- college-of-physicians-of-edinburgh-2422/page/5/sort_by/object.lifecycle.creation.date.earliest/order/asc/view_as/grid