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Noble gas - Chemistry | | Noble gas - Chemistry: Encyclopedia II - Noble gas - Chemistry | | Because of their unreactivity, the noble gases were not discovered until 1868, when helium was detected spectrographically in the Sun. The isolation of helium on Earth had to wait until 1895. The noble gases have very weak inter-atomic forces of attraction, and consequently very low melting points and boiling points. This is why they are all gases under normal conditions, even those with larger atomic masses than many normally solid elements.
The periodic table contains an empty space under radon, with atomic number 118. This indicates the existence, albeit short-lived, of an as yet undiscovered noble gas, which ...
See also:Noble gas, Noble gas - Etymology, Noble gas - Chemistry, Noble gas - Applications, Noble gas - Physical Properties | | | Noble gas, Noble gas - Applications, Noble gas - Chemistry, Noble gas - Etymology, Noble gas - Physical Properties | | |
| | | Noble gas: Encyclopedia II - Noble gas - Chemistry
Noble gas - Chemistry
Because of their unreactivity, the noble gases were not discovered until 1868, when helium was detected spectrographically in the Sun. The isolation of helium on Earth had to wait until 1895. The noble gases have very weak inter-atomic forces of attraction, and consequently very low melting points and boiling points. This is why they are all gases under normal conditions, even those with larger atomic masses than many normally solid elements.
The periodic table contains an empty space under radon, with atomic number 118. This indicates the existence, albeit short-lived, of an as yet undiscovered noble gas, which has been temporarily named ununoctium.
Although noble gases are largely unreactive, they do form compounds under certain conditions.
Other related archives1868, 1895, Earth, Noble metals, Sun, argon, atmosphere, atomic masses, atomic number, boiling points, chemical elements, chemical series, compounds, corrosion, gases, group 18, helium, inert gases, krypton, light bulbs, melting points, neon, neon lights, periodic table, radon, short-lived, spectrographically, ununoctium, xenon
 Adapted from the Wikipedia article "Chemistry", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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