Ramsay abundance

The element was discovered by Lord Raleigh and Sir William Ramsay in 1894. Argon is the third most abundant element in the atmosphere. Its concentration in air is 0.934% by volume. Also, it occurs in earth s crust at a concentration of 3.4 mg/kg, and in the sea water at 4.3 pg/L. It was most likely formed in earth crust by radioactive decay of K-40 and seeped out into the... 

Because helium forms no compounds and is almost absent in the Earth s atmosphere, it was unknown for a long time. The first clue leading to its discovery was an unidentified yellow emission line in the solar chromospheric spectrum observed by French astronomer Pierre Janssen during an eclipse of the Sun in 1868. Lockyer named the unknown element helium for the Greek sun god, helios. Subsequendy it was discovered to be rather abundant in radioactive rocks, where it is trapped after emission from uranium series alpha decays. Ramsay and Soddy showed that the alpha rays were helium atoms whose electrons had been stripped away. In his biography of Lord Rutherford, A. S. Eve wrote ... 

The work of Ramsay and Travers was very difficult, however, because the gases they were looking for are not abundant in air. Krypton, for example, makes up only about 0.000114 percent of air. For every 100 liters of liquid air, there would be only 0.00011, or about one-tenth of a milliliter of krypton. A 10th of a milliliter is about a drop. So Ramsay and Travers—although they didn t know it— were looking for one drop of krypton in 100 liters of liquid air ... 

The principal isotope of argon is °Ar (99.6% abundance) it has two other stable isotopes, Ar (0.3%) and Ar (0.1%). Argon-40 is formed by jS-decay of the long-lived potassium isotope see also Noble Gases Ramsay, William Strutt, John. 

Neon is produced within stars during nucleosynthesis. It has three stable isotopes, of which neon-20 is the most abundant (90.5%). see also Gases Noble Gases Ramsay, William Travers, Morris. 

DOS, Argon. Ar at. wt 39,948 at- no. 18. Three stable isotopes 36 (0.337%) 38 (0.063%) 40 (99.600%) artificial, radioactive isotopesr 33 35. 37 39 4] 42. Abundance in earth s crust 4 X 10 % concentration in the atmosphere 0.93% by vol cosmic abundance 1.5 X 10 atom M0 atoms of Si. Elemental, monoatomic, gaseous constituent Of air, discovered by Rayleigh and Ramsay in 1894. Although molecular ions, hydrates and cl at h rates of argon have been observed, it should be considered a noble , chemically inert gas, due to its electronic structure. The outer p subshell is entirely filled ls22s42p63s23p6. Obtained commercially... 

Radon Rn is the 86th element of the periodic system. It is the heaviest of the noble gases. It is highly radioactive and its natural abundance is so low that it could not be identified when W. Ramsay and M. Travers discovered other inert elements. Only application of the radiometric method made possible the discovery of radon. 

Neon [7440-01-9], with the chemical symbol, Ne, atomic number 10, and the relative atomic molar mass of20.1797(6) is the second most abundant noble gas in the air (0.0018 vol.%) after argon. Neon was named from the Greek, neos, for new, and was discovered by Morris W. Travers and Sir William Ramsay in 1898. Neon has a low density of 0.900 kg.m (S.G. 0.696) and it solidifies at -248.58 C (24.57 K) and boils at -246.06 C (27.09 K) under atmospheric pressure. Neon has three stable isotopes Ne (90.48 at.%), Ne (0.270 aL%) and Ne (9.250 aL%). Neon is poorly soluble in water with a solubility of 10.5 cm per kg of water at 20"C. Neon is extensively used in lighting tubes because of the intense red line emitted during electric discharge. 

Helium — (Gr. helios, the sun), He at. wt. 4.002602(2) at. no. 2 m.p. below — 272.2°C (26 atm) b.p. — 268.93°C -267.96°C density 0.1785 g/1 (0°C, 1 atm) liquid density 7.62 lb/ft5 at. b.p. valence usually 0. Evidence of the existence of helium was first obtained by Janssen during the solar eclipse of 1868 when he detected a new line in the solar spectrum Lockyer and Frankland suggested the name helium for the new element in 1895, Ramsay discovered helium in the uranium mineral cleveite, and it was independently discovered in cleveite by the Swedish chemists Cleve and Langlet about the same time. Rutherford and Royds in 1907 demonstrated that a particles are helium nuclei. Except for hydrogen, helium is the most abundant element found throughout the universe. Helium is extracted from natural gas all natural gas contains at least trace quantities of helium. It has been... 

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