Inventors and Scientific Discoveries

Dmitri Mendeleev is credited with creating the first version of the periodic table in 1869, arranging elements by atomic mass. While others like Moseley later refined it using atomic numbers, Mendeleev is recognized as its primary creator.

Sir Humphry Davy isolated Barium in 1808 using electrolysis of molten barium salts.

Daniel Rutherford is credited with the discovery of nitrogen in 1772. He isolated it by removing oxygen and carbon dioxide from air.

Boron was isolated independently in 1808 by two separate groups: Sir Humphry Davy, and the team of Joseph Louis Gay-Lussac and Louis Jacques Thenard.

Joseph Priestley is widely credited with the discovery of oxygen in 1774, when he isolated it by heating mercuric oxide.

Martin Heinrich Klaproth discovered uranium in 1789 while analyzing pitchblende ore. He named the element after the planet Uranus.

Whittaker described 5 kingdoms of living organisms. They are Monera, Protista, Fungi, Plantae and Animalia.

Evangelista Torricelli is credited with creating the first artificial vacuum in 1643 using a mercury barometer. The option 'Torry selli' is a phonetic misspelling of his name.

Michael Faraday invented the first electric dynamo in 1831, demonstrating electromagnetic induction.

Humphry Davy first isolated calcium in 1808 by electrolysis of a mixture of lime and mercuric oxide.

Kirkpatrick Macmillan is generally credited with inventing the first pedal-driven bicycle in the 1830s.

Unix was primarily developed by Ken Thompson and Dennis Ritchie at Bell Labs.

Neutrons were discovered by James Chadwick.

Samuel Morse was an American inventor who contributed to the invention of a single-wire telegraph system and co-developed the Morse code.

Harvey Apthkar coined the term microdentistry in 1980.