who$who discovered hydrogen$oxygen?
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There is some dispute over who discovered oxygen.  Joseph Priestley and Antoine Lavoisier both worked on the discovery of oxygen.  Lavoisier published his work first, but I believe that Priestly did his work first.\n\nAntoine Lavoisier named hydrogen, but it was generated and described in earlier experiments by Theophrastus Bombastus von Hohenheim, Robert Boyle, and Henry Cavendish.
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One of these scientists, a man named Democritus, would sit here in the central market place of Athens, Greece, and explain to one and all how all things on earth and in the heavens are made of extremely tiny, simple particles. He called them "atoms.o/oo \n\n\nThus when the element hydrogen combines with the element oxygen, it must do so all or none. In the case of water, for instance, one atom of oxygen combines with two atoms of hydrogen. Now when oxygen combines with carbon to make carbon dioxide, two oxygen atoms combine with one carbon atom. And when they make carbon monoxide, it is one atom oxygen to one atom carbon. So, too, all other chemical compounds are made of a simple combination of a few basic atoms.
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Hydrogen was first produced by Theophratus Bombastus von Hohenheim (1493–1541)—also known as Paracelsus—by mixing metals with acids. He was unaware that the explosive gas produced by this chemical reaction was hydrogen. In 1671, Robert Boyle described the reaction between two iron fillings and dilute acids, which results in the production of gaseous hydrogen.[3] In 1766, Henry Cavendish was the first to recognize hydrogen as a discrete substance, by identifying the gas from this reaction as "inflammable" and finding that the gas produces water when burned in air. Cavendish stumbled on hydrogen when experimenting with acids and mercury. Although he wrongly assumed that hydrogen was a compound of mercury—and not of the acid—he was still able to accurately describe several key properties of hydrogen.\n\nAntoine Lavoisier gave the element its name and proved that water is composed of hydrogen and oxygen. One of the first uses of the element was for balloons. The hydrogen was obtained by mixing sulfuric acid and iron. In 1931, Harold C. Urey discovered deuterium, an isotope of hydrogen, by repeated distilling the same sample of water. For this discovery, Urey received the Nobel Prize in Chemistry in 1934. In the same year, the third isotope, tritium, was discovered. Because of its relatively simple structure, hydrogen has often been used in models of how an atom works.
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carbon, hydrogen and oxygen.
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One of the earliest attempts to explain the nature of water was made by the Greek philosopher Aristotle in 335 B.C. when he issued his Theory of Matter. According to Aristotle's theory, every substance was a combination of four basic elements—fire, earth, air and water. This idea was to keep alchemists busy for centuries trying to change common metals into gold by rearranging their "elements." They were not very successful, however, since no one was ever able to break down a substance and find out just how much fire, earth, air and water was in it. Not until the eighteenth century did scientists decide that air, earth and fire were not really elements at all, and in 1781 a British chemist proved that water wasn't an element either.\n\nThat year Joseph Priestley exploded a mixture of air and hydrogen in a bottle as "a mere random experiment to entertain a few philosophical friends," and noted with interest that the explosion caused moisture to condense inside the bottle. He repeated the experiment until he was certain that the moisture was produced from the reaction of air and hydrogen, thereby proving that water, rather than being a basic element, was itself composed of other chemicals.\n\nIn 1783 the French chemist Antoine Lavoisier elaborated on Priestley's experiment and discovered that the hydrogen was not combining with air to form water, but only with the oxygen in air. Further experiments determined that a molecule of water contained two atoms of hydrogen and one atom of oxygen, a chemical combination which has been given the symbol H2O.\n\nThe discovery that water was H2O or "hydrogen oxide" raised more questions than it answered, for chemists learned that despite its apparent simplicity water is actually a most puzzling and paradoxical substance which seems to defy the rules of chemistry.\n\nCompared to other liquids, water requires a great deal of heat to raise its temperature even a few degrees, and once it is warm it loses its heat slowly. This ability to "store" heat enables water to modify the world's climate. Oceans don't warm up as fast as the coastlines they touch, nor do the)' cool off as fast, with the result that coastal areas usually have milder winters and cooler summers than areas inland. For example, Bismarck, North Dakota has average temperatures of 8 degrees in January and 70 degrees in July, while Seattle, at the same latitude, has averages of 41 degrees and 66 degrees for the same two months.\n\nWater is the only substance found abundantly in all three natural forms—liquid, solid and gas. But in changing from one form to another some more peculiarities become evident. One of water's most paradoxical qualities is that when it changes into a solid it expands (and so becomes relatively lighter for its volume). Other substances, with the exception of bismuth, contract or condense and so become relatively heavier. Of course, if water condensed when it froze the world would have some serious problems. Ice would form on the bottom of a lake because it would be denser and therefore heavier than the liquid water. And there it would stay, growing upwards, killing all marine life. Underneath the surface, shielded from much of the sun's heat, very little of it would melt in the spring and eventually the rivers, lakes and seas in cooler parts of the world would become solid ice.\n\nThe world would have different but even greater temperature problems if there were no water vapor in the air to absorb the sun's heat during the day and retain it during the night. Daylight hours would be miserably hot, and nightfall would bring freezing temperatures. In southern states where winter crops are grown, farmers dread a cold, dry, clear night for this same reason. Without clouds and moist air to act as insulation, the earth's heat quickly escapes, permitting the temperature to drop unusually low and sometimes ruin citrus fruit and tender pl
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two parts hydrogen.......one part oxygen...hence.....H2O
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Two hydrogen atoms, one oxygen atom.  H2O
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1- Albert Eienstien ( His work in explaining the electrophotonic cell based on quantum mechanics)...note: this is not his greatest work, the theory of relativity is more important but it was not understandable by other scientists that time.\n\n2- Maxwell ( His work in establish the Electromagnetic Theory ).\n\n3- NIELS BOHR (for his services in the investigation of the structure of atoms and of the radiation emanating from them)\n\n4- WERNER HEISENBERG (for the creation of quantum mechanics, the application of which has, inter alia, led to the discovery of the allotropic forms of hydrogen)\n\n5-  WOLFGANG PAULI (for the discovery of the Exclusion Principle, also called the Pauli Principle)
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Water. Water contains two hydrogens and one oxygen. It's technical name should be dihydrogen monoxide, but we knew about water before chemistry was officially developed.
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The existence of promethium was first predicted by Bohuslav Brauner in 1902; this prediction was confirmed by Henry Moseley in 1914. Several groups claimed to have produced the element, but they could not confirm their discoveries because of the difficulty of separating promethium from other elements. Proof of the existence of promethium was obtained in 1945 by Jacob A. Marinsky, Lawrence E. Glendenin and Charles D. Coryell during the analysis of byproducts of uranium fission; however, being too busy with defense-related research during World War II, they did not announce their discovery until 1947
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(m)\n\nHeavy water is dideuterium oxide, or D2O or 2H2O. It is chemically the same as normal water, H2O, but the hydrogen atoms are of the heavy isotope deuterium, in which the nucleus contains a neutron in addition to the proton found in the nucleus of any hydrogen atom. Gilbert Newton Lewis isolated the first sample of pure heavy water in 1933.
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The word oxygen derives from two words in Greek, οξυς (oxys) (acid, sharp) and γεινομαι (geinomai) (engender). The name "oxygen" was chosen because, at the time it was discovered in the late 18th century, it was believed that all acids contained oxygen.
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The first clue that certain gases could be distinguished from ordinary air was discovered around 1630 by Jan van Helmont, who introduced the term gas. During the rest of the century, scientists learned more about air, and the barometer was invented for measuring air pressure. During the 1700s, the individual gases contained in air were being investigated, but chemists were still confused about how to define them. Gases were called " airs" because scientists thought that they were just contaminated forms of air.\n\nChemists also argued about the role of different gases in the processes of combustion, or burning, and respiration, or breathing. Today we know that these processes use oxygen and produce carbon dioxide. But at that time, scientists had only a vague notion of these basic chemical reactions. At first they tested their ideas by such simple experiments as burning candles inside a glass jar with a limited supply of air, or enclosing birds and small animals in a jar to see how long they were able to breathe. German chemist George Ernst Stahl proposed that a substance called phlogiston was what gave materials their ability to burn. Supposedly, phlogiston was released from burning materials and absorbed by the air. Despite some controversy, the phlogiston theory was widely accepted for many years and resulted in the discovery of several gases.\n\nThen in the 1770s, Antoine-Laurent Lavoisier developed the modern theory of combustion, which replaced the phlogiston theory. Lavoisier proved that air is composed mainly of two gases--one that supports combustion and one that does not. Lavoisier showed that during combustion a portion of the air (about one-fifth) combines with the substance being burned and adds weight to the resulting compound. The rest of the air, which is inactive, is left behind. Then Lavoisier reversed the process, showing that when the compound is decomposed, the original active portion of the air is released. When this portion is mixed with the inactive air, the mixture is the same as ordinary air. Lavoisier named the active gas "oxygen " and called the inactive portion of air azote..\n\nAlthough Lavoisier clarified the process of combustion, other chemists before him had already discovered most of the gases contained in air and had begun studying their properties. In 1772 Carl Wilhelm Scheele discovered oxygen, which he called " fire air." He also showed that air contains another gas, "foul air," which does not support combustion. But publication of Scheele 's report was delayed, and Joseph Priestley is usually credited with oxygen's discovery. The gas that Lavoisier called azote is known today as nitrogen. It was first identified in 1772 by Daniel Rutherford\n\nIn the late 1700s, Henry Cavendish determined that air contains about 21 percent oxygen. More than a hundred years later, William Ramsay discovered that a small percentage of air--about 1 percent--is composed of inert gases, mainly argon. The remaining 78 percent of air is nitrogen, although carbon dioxide is also present in tiny amounts (about 0.03 percent). In a series of some 400 experiments, Cavendish also found that the composition of air is virtually the same, regardless of the air's geographic origin. His results were confirmed during the late 1800s, when more precise scientific studies showed that air's composition is the same all over Earth.\n\nThe air's gases are responsible for making the sky appear blue. Gas molecules scatter the Sun's light, and the blue color in the light's spectrum is scattered more thoroughly than other colors. Normally air also contains some moisture, or water vapor, which we measure as humidity, as well as small particles of dust suspended in the air's gases. Moisture and light combine to create such spectacular visual effects as rainbows and sunsets. Unfortunately, today's air also contains many pollutants such as ozone, sulfur dioxide, a
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Benjamin Franklin but a lot of scientists contributed in the discovery. It all started 600 BC with the greeks followed by Dr William Gilbert,Benjamin Franklin,Galvani and Volta,Michael Faraday,Thomas Edison and Joseph Swan,George Westinghouse and Nikola Tesla,James Watt and finally Andre Ampere and George Ohm
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water is  H2O, it's two separate element on the periodic chart - H for hydrogen and O for oxygen.
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oxygen, nitrogen, hydrogen, methane, helium
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1 Theory: Jabir Ibn Haiyan, known as the alchemist Geber of the Middle Ages, is generally known as the Father of Chemistry.\n\nHis full name was Abu Musa Jabir Ibn Hayyan. He had established himself as one of the leading scientist while he practiced medicine and alchemy in Kufa (in present day Iraq) around 776 C.E. In his early days, he was under the patronage of the Barmaki Vizier during the Abbasid Caliphate of Haroon al-Rashid. Jabir died in Kufa in 803 C.E.\n\n2nd Theory: The father of physical chemistry\n\n\nWilhelm Ostwald, best known for his work on catalysis and chemical affinity, was born 150 years ago this year.\n\n3rd theory: The French chemist Antoine Laurent Lavoisier helped establish modern\nchemical nomenclature, named oxygen and discovered its role\nin combustion, and propounded the law of conservation\nof matter—achievements that inspire\ntextbooks to dub him the father of modern\nchemistry.