1800AD-1875AD

=John Dalton Has erectile disfunction and a mangina 1802 AD= This is Daltons Atomic Theory : · All matter is composed of atoms · Atoms cannot be made or destroyed · All atoms of the same element are identical · Different elements have different types of atoms · Chemical reactions occur when atoms are rearranged · Compounds are formed from atoms of the constituent elements. Daltons Atomic theory was nearly correct. John Dalton discovered the atomic mass of hydrogen to be one. He discovered that elements combine in ratios. Dalton was the most advanced chemist of his time. Dalton died in 1844.

=Armedeo Avagadro 1811= == Armedo Avagadro was bron in 1776 in Italy. Italy was not a place for chemistry like France, Germany, or England. He hypothesized that an equal volume of gasses at the same temperature and pressure have the same molecular weight. From this we can find how many molecules are in a given substance. This is called Avogadro's number. He also noticed that simple gasses are not made of just one atom, but two atoms or more. Avagadro believed that when water is boiled the oxygen atom splits into two atoms. Avagadro's theory was not believed to be credible until 50 years after its original publishing date. Avagadro died in 1856. =Joseph Louis Lussac 1811= Gay-Lussac was born in 1778 in France. He is known for the discovery of Iodine and Boron. He is also know for his research on the behavior of gasses. With his knowledge of gasses he made the first hot-air balloon. He found out that the pressure and mass of the gas increases linearly when the temperature rises. __The equation for this is V=KT.he tradgicly died from errectial disfunction.__ =Michael Farady 1831= == Michael Farady was born in England in 1791. Farady is know for his research into electricity and electrolysis. He believed that since an electric current caused a magnet field, a magnetic field should cause an electric current. This was his principle of induction. His research made generators possible, which creates electric current by mechanical means. Farady's research was rejected because it was not yet proven mathematically. James Maxwell proved Farady's research. Farady died in 1867. =DImitri Mendeleev 1871= == Dimitri Mendeleev was born in Russia in 1834. Mendeleev is know for his creation of the first periodic table of elements. He predicted the properties of elements that were yet to be discovered, based on his table. He was honored all over Europe for his table. He has a crater on the moon named after him. He also has element 101 named after him. Mendeleev died in 1907.