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noble gases

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Why was mendeleev unable to make any predictions about the noble gas elements?

The reason that Mendeleev didn't make any predictions about the gases was that these gases were not even discovered yet, therefore it was impossible for Mendeleev to make predictions.----Dmitri Mendeleev made his predictions on what would fill the gaps on his far from perfect periodic table. He predicted their sizes, weights, appearances, etc.I think the reason he didn't make predictions is because noble gases are not visible, and weightless.-------------------------------Mendeleev couldn't predict the noble gases' properties because their existence wasn't known, as implied above.Argon, a noble gas, was noticed twenty-five years later by John William Strutt and Sir William Ramsey (the names are not really important).It doesn't matter that the elements weren't discovered. That's the whole point of arranging the elements. To PREDICT the properties of the missing/unknown ones.


When did William Ramsey discover the noble gases?

In mid-1894, Sir William Ramsay worked in conjunction with John William Strutt, Lord Rayleigh, on research which led to the discovery of Argon. They announced the discovery at the meeting of the British Association in August 1894, and in 1904 were awarded Nobel Prizes for the discovery. According to his Nobel Committee biography, Ramsay went on to discover Helium in 1895; and in 1898 he found Neon, Krypton and Xenon.


Did J.J. Thomson discover isotopes?

No, J.J. Thomson did not discover isotopes. Isotopes were discovered by Frederick Soddy and John William Strutt in the early 20th century. J.J. Thomson is known for his discovery of the electron.


How gases were discovered?

It was discovered in 1894 and it was Argon.In 1785 Henry Cavendish, an English chemist and physicist, found that air contains a small proportion (slightly less than 1 percent) of a substance that is chemically less active than nitrogen. A century later Lord Rayleigh, an English physicist, isolated from the air a gas that he thought was pure nitrogen, but he found that it was denser than nitrogen that had been prepared by liberating it from its compounds. He reasoned that his aerial nitrogen must contain a small amount of a denser gas. In 1894, Sir William Ramsay, a Scottish chemist, collaborated with Rayleigh in isolating this gas, which proved to be a new element---argon.for more information: "http://www.britannica.com/EBchecked/topic/416955/noble-gas"


Who invented seismology?

Earth quakes habeen around since before recorded history so to find the name of the first person on Earth to have understood that the ground was shaking would be a daunting task to say the least. ^^ Its obviously understood that Earthquakes have been noticed by people for hundreds of years, but the first person to do any real scientific investigation on Earthquakes was a man by the name Ernie Quaker. Ernie also named Earth "Quakes" hence his last name.