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noble gases
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∙ 13y ago
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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.
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.
Which technique has been used by scientists to determine that the earth is at least 4.5 billion years old?
Various methods have been used to date the earth itself, particularly, but not limited to, various radiometric techniques. In 1862, Lord Kelvin announced that he had calculated the time it would take the world to cool down from its molten state. He calculated that this was between 20 and 400 million years, but later refined his calculations to within the range 20 to 100 million years. With the subsequent discovery of radioactivity, it was soon realised that the uranium present in the earth could have prolonged its cooling for as long as necessary to harmonise with other methods. In the early years of the twentieth century, Rutherford established the age of a rock as 500 million years, by measuring the amounts of radium and helium present. Strutt soon realised that some of the helium would have escaped as the rocks were crushed for analysis, leading to false short estimates of the ages of the rocks - they were really even older than the initial estimates. In the late 1930s and early 1940s, using the new techniques and the world's most advanced mass spectromoter, Alfred Nier dated some rocks at up to 2570 million years old. Essentially all that was needed from now on was to find the oldest possible rocks on earth and calculate the time in which the earth's crust existed in a molten state before the rocks were formed. The oldest so far found on earth are zircon crystals found in Western Australia, that are more than 4.4 billion years old. The oldest known solid constituents of meteorites formed within the solar system are 4.567 billion years old, giving a probable upper limit for the age of Earth.
Who discovered aragon?
Argon is an element with the symbol Ar and atomic number of 18. It was discovered by William Ramsay and John William Strutt.
When was argon first discovered?
Argon was supposedly discovered in 1894 by 2 European chemists (William Ramsay a brit, and John Strutt, a scotsman)
When did Elizabeth Strutt die?
Elizabeth Strutt died in 1867.
When was Elizabeth Strutt born?
Elizabeth Strutt was born in 1782.
When was Faye Strutt born?
Faye Strutt was born in 1947.
When was Clive Strutt born?
Clive Strutt was born in 1942.
When did Nick Strutt die?
Nick Strutt died in 2009.
When was Nick Strutt born?
Nick Strutt was born in 1946.
When was Jedediah Strutt born?
Jedediah Strutt was born in 1726.
When was the UK company Strutt and Parker founded?
Strutt and Parker, a UK property partnership was founded in 1885 by Edward Strutt and Charles Parker. Today Strutt and Parker are one of the largest property partnerships in the UK.
When did William Strutt die?
William Strutt died on 1915-01-03.
What is John Strutt's birthday?
John Strutt was born on November 12, 1842.
