Sánchez

Events

Lavoisier

August 26th 1743 - May 8th 1794

1- The law of conservation of mass
2- The nature of combustión
3- Water is a compound
4- Elements and chemical nomenclature
5- The first chemistry textbook

Smallpox Vaccine

1796 - 1970

Although Lady Mary brought the idea to the West, Edward Jenner is the one credited with discovering and developing the modern vaccine for smallpox.he was able to make a vaccine that was safer to use for humans. In fact, the word “vaccine” is actually derived from the Latin word “vaca,” which means cow. He did many experiments with his cowpox vaccine and in 1796, he presented his data to the Royal Society. Jenner was able to reduce the death rate from smallpox from a high mortality rate down to almost zero.
In the 1970s, it was announced that the smallpox vaccine had essentially been eradicate.

Atomic Theory

1808

John-DaltonIn 1808, John Dalton discovered a way to link invisible atoms together to things that had measurable qualities, such as a mineral’s mass or the volume of a certain gas. In his theory, he stated that elements consist of small microscopic particles that are called atoms.
Dalton wasn’t the first person to believe that all life was made up of tiny particles called atoms, though. This idea originated to the 5th century in Greece when Leucippus of Miletus, a Greek philosopher of the time, and his student Democritus believed that atoms were too small to be seen.

Dalton's Atomic Model

1808

Cannizzaro

July 13th 1826 - May 10th 1910

1- Explanation of the Avogadro hypothesis
2- Reaction Cannizzaro
3-Differentiation between molecular weight and atomic weight
4-Cannizzaro and the periodic table
5-The second revolution of chemistry

Mendeleev

July 13th 1826 - May 10th 1910

1- Explanation of the Avogadro hypothesis
2- Reaction Cannizzaro
3-Differentiation between molecular weight and atomic weight
4-Cannizzaro and the periodic table
5-The second revolution of chemistry

Gilbert N. Lewis

October 23 1875 - March 23 1946

1-The cubic atom
2-The octet rule
3-Heavy water
4-The structure of Lewis

Radioactivity

1890 - 1900

In the 1890s and early 1900s, Marie and Pierre Curie worked with uranium ore, extracting the uranium from it and experimenting with it and studying it. As a result, they discovered and were able to isolate radioactive materials. Marie found that the residual materials from the uranium were actually more active than pure uranium.
In 1903, the Curies and Becquerel shared the Nobel Prize in physics for their work in discovering radioactivity. Marie Curie won another Nobel Prize in 1911 for discovering radium and polonium, becoming the only person to win two Nobel Prizes.

Electrons

1897

1897 when JJ Thomson decided to find out what exactly was going on with electric currents.
During his experiments, he found that the cathode rays bend over to one side. As a result, he determined that cathode rays must be made of small particles, which he termed “corpuscles.” At first, he thought these small particles were too small for anybody to care about. However, he found out that electric currents were composed of moving electrons. And since most of the products that people use these days are operated by electricity, the electron became one of the most important discoveries in chemistry and physics.

Atomic Model of Thomson

1898

Pauling

February 28th 1901 - August 19th 1994

1-The electronegativity
2-The nature of the chemical bond
3-structure of crystal molecules
4-Discovery of the alpha helix and the beta sheet
5-Serology

Atomic Model of Rutherford

1911

Atomic Model of Niels Bohr

1913

LSD

1938

One of the most popular and most widely used psychedelic drugs during the 1960s was LSD.
Swiss chemist Albert Hoffman is credited with being the first to synthesize LSD on November 16, 1938 while working in Switzerland at the Sandoz Laboratories.