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- Venus (planet) (31010 bytes)
3: ...uring the daytime, making it one of only two heavenly bodies that can be seen both day and night (the ...
7: The adjective ''Venusian'' is commonly used for Venus, but it is etymologically incorre...
14: ...nds in the upper atmosphere circle the planet in only 4 days, helping to distribute the heat.
16: ...ght back into space. This prevents most of the sunlight from ever heating the surface. Venus's [[Bol...
18: ... of force against obstructions. The clouds are mainly composed of [[sulfur dioxide]] and [[sulfuric ac... - Neptune (planet) (18545 bytes)
130: | [[Deuterium|Hydrogen Deuteride]] - HD
138: Neptune has been visited by only one spacecraft, ''[[Voyager 2]]'', which flew by...
152: ...ry day; because it was stationary in the sky and only beginning the planet's yearly retrograde cycle, ... - Atom (12300 bytes)
43: ...fferentiable as a certain [[chemical element]]. Only 90 elements (of 112 now known) have been identif...
58: ... this to the size of the [[proton]] which is the only particle in the [[nucleus]] of the hydrogen atom...
65: ...isotope which also contains 1 neutron is called [[deuterium]] or hydrogen-2; the hydrogen isotope with 2 neut...
80: ...ly most outward is the valence shell, even if it only has one electron.
94: ...is all that we can observe since the universe is only about 14 billion years old. - Hydrogen (20221 bytes)
92: | [[Deuterium|<sup>2</sup>H]]
113: ...omic gas, H<sub>2</sub>, with a boiling point of only 20.27 [[Kelvin|K]] and a melting point of 1...
130: ...and is also used in [[nuclear fusion]] reactions. Deuterium compounds have applications in [[chemistry]] and ...
139: [[Deuterium]], an [[isotope]] of hydrogen, was discovered by ...
144: ...[[quantum mechanics]] the electron is allowed to only be at very specific distances from the proton. M... - Lithium (11359 bytes)
134: ... is the lightest metal and has a density that is only half that of [[water]]. Like all alkali metals,...
141: ...rugs. Useful amounts of Lithium for this use are only slightly lower than toxic amounts, so that the b...
150: ...ithium-7 produce [[tritium]]. Tritium fuses with deuterium in a [[Nuclear fusion| fusion]] reaction that is ...
178: *[http://periodic.lanl.gov/elements/3.html Los Alamos National Laborator... - Technetium (32113 bytes)
184: ...elements. On earth, technetium occurs naturally only in uranium ores as a product of spontaneous fiss...
187: ...ance similar to [[platinum]]. However, it is commonly obtained as a grey powder. Its position in the p...
189: ...[oxygen|O]]<sub>4</sub><sup>-</sup>.{{inote | ''LANL Periodic Table'', "Technetium" paragraph 3}} Com...
229: ... Building Blocks'', page 424, paragraph 2 and ''LANL Periodic Table'', "Technetium", paragraph 1}} Uni...
233: ...made by B.T. Kenna and P.K. Kuroda. {{inote | ''LANL Periodic Table'', "Technetium" paragraph 1}} The... - Star (12279 bytes)
3: ...h to appear as a disk instead, and to provide [[sunlight|daylight]].
11: ...ive star is long extinct, however, and currently only theoretical.
13: ...], a companion to AB Doradus A, which has a mass only 93 times that of [[Jupiter (planet)|Jupiter]]. S...
33: ...ough for further fusion to take place, supported only by [[degeneracy|degeneracy pressure]], called a ...
36: ... star to explode in a [[supernova]]. This is the only cosmic process that happens on human timescales;... - Spectrophotometry (4459 bytes)
25: ...n a near-IR/VIS/UV spectrophotometer, typically a deuterium gas discharge lamp) is guided through a monochrom...
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