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- Periodic table (7298 bytes)
96: * [[Isotope table (complete)]]
97: * [[Isotope table (divided)]] - List of elements by symbol (14812 bytes)
39: <tr><td>Fr</td><td>[[francium]]</td><td>87</td><td></td></tr>
114: ...><td>[[tungsten]]</td><td>74</td><td>(German ''Wolfram'')</td></tr>
127: ...]</td><td>86</td><td>Name given at one time to an isotope of [[radon]] identified in the decay chain of [[a...
139: ...rancium]]</td><td>87</td><td>Current symbol is '''Fr'''.</td></tr>
140: <tr><td>Fr</td><td>[[florentium]]</td><td>61</td><td>Discred... - Actinium (7046 bytes)
96: ! colspan="2" bgcolor="#ff99cc" | Most stable isotopes
101: ! [[Isotope|iso]]
108: | <sup>225</sup>Ac || [[synthetic radioisotope|{syn.}]]
110: | <sup>221</sup>[[francium|Fr]]
119: | α || 5.536 || <sup>222</sup>[[francium|Fr]] - Thyroid (5421 bytes)
3: ...e system|endocrine]] gland. It is situated on the front side of the neck at the level of C5 and T1 ver...
14: ...ne]] (more accurately iodide ions, I<sup>-</sup>) from the bloodstream and concentrate it for producti...
20: ...cil can prevent tadpoles from metamorphosing into frogs; conversely, administering thyroxine will trig...
22: ...this is done by analysis of a small drop of blood from the child (usually, the blood also is tested fo...
24: ...researchers making compounds labelled with iodine isotopes do this, in the wider world such preventive meas... - Egyptian chronology (11665 bytes)
21: ...Not a single [[eclipse]] record has been utilized from that period so far. Pharaoh [[Sahure]] or [[Sep...
23: ...0) years for the [[half-life]] of the carbon-14 [[isotope]].
29: ...or later, page 307). Edgerton points out that the fragment of the el-Lahun temple register that forete...
31: ...8th year and death of [[Shoshenq V]]; if reckoned from 822 BCE, then the end of Shoshenq's reign falls...
38: ...nown for certian when or where the Egyptians come from and what the Egyptians knew of their own histor... - Geology (12007 bytes)
1: '''Geology''' (from [[Greek language|Greek]] γη- (''ge-''...
3: ... which includes the [[Crust (geology)|crust]], is fragmented into [[tectonic plates]] that move over a...
10: ...gical [[stratum]] in a mountain hundreds of miles from the ocean, he inferred that the land was formed...
12: ...her languages of Europe such as [[French language|French]]. [[Georg Bauer]] (Georg Agricola), a physic...
16: ... the [[Volcano|volcanic]] origins of this part of France. [[James Hutton]] recorded his ''Theory of th... - Age of the Earth (20052 bytes)
1: ...arth is not exactly known yet and the predictions from different accretion models vary between several...
4: ...s Ussher]] of [[Armagh]], [[Ireland]], calculated from the Bible (augmented by some [[astronomy]] and ...
6: ...ho thought the Earth and [[universe]] had existed from eternity.
9: ...tury]] that the Earth had been created separately from the rest of the universe, several hundred thous...
11: ... mostly speculative, but in [[1779]] the [[France|French]] naturalist the [[Georges-Louis Leclerc, Com... - List of reference tables (55289 bytes)
7: ... allowing the link to be accessible in the future from the toolbar.
137: *[[Isotope table (divided)]]
138: *[[Isotope table (complete)]]
143: *[[List of stable isotopes]]
178: *[[List of largest optical refracting telescopes]] - Venus (planet) (31010 bytes)
1: '''Venus''', the second [[planet]] from the [[Sun]], is named after the [[Roman mytholo...
3: ..., it always appears in roughly the same direction from Earth as the Sun (the greatest [[elongation]] i...
7: ...me astronomers use ''[[Cytherean]]'', which comes from [[Cythera]]. Other less common adjectives incl...
14: ...]'s, even though Venus is nearly twice as distant from the Sun and only receives 25% of the solar irra...
16: ...k into space. This prevents most of the sunlight from ever heating the surface. Venus's [[Bolometer|... - Atom (12300 bytes)
45: ...ons (but the same number of protons) are called [[isotope]]s of a chemical element.
58: ...rbitals just gradually go to zero as the distance from the nucleus increases. For atoms that can form ...
60: ===Elements and isotopes===
63: ...ope]]s of an element. When writing the name of an isotope, the element name is followed by the mass number....
65: ... called [[deuterium]] or hydrogen-2; the hydrogen isotope with 2 neutrons is called [[tritium]] or hydrogen... - Chemical element (8169 bytes)
3: ...fer in the number of neutrons, and are known as [[isotope]]s of the element. The [[atomic mass]] of an elem...
11: ...number of [[neutron]]s are said to be different [[isotope]]s of the element. A pure element can exist as mo...
15: ...or "sodium" and "kalium" for "potassium," and the French prefer the obsolete but historic term "azote"...
17: ...element is not capitalized, even if it is derived from a proper noun (unless it would be capitalized b...
21: ...reticent about relinquishing naming rights to the French, often calling it "cassiopium"). And notably,... - Proton (5009 bytes)
50: The [[atomic nucleus|nucleus]] of the most common isotope of the [[hydrogen]] [[atom]] is a single proton. ...
59: ...was an elementary particle. This he named proton, from ''protos'', the Greek for "first". - Atomic mass (3063 bytes)
1: ...sotope has an atomic mass of exactly 12. No other isotope mass works out to a whole number due to the effec...
3: The atomic mass of an isotope is approximately an integer: in most cases the fi...
5: ...6, then increases to positive values in the heavy isotopes, with increasing atomic number. This corresponds...
7: ... the relative natural abundances of the element's isotopes. This is the atomic mass used in [[stoichiometri...
22: * [[isotope]] - Alchemy (42222 bytes)
8: ...ld and silver". The Arabic therefore could derive from a purely Greek word, not Coptic, and have been ...
11: ...f [[mysticism]] and [[magic (paranormal)|magic]]. From today's perspective, their endeavours and belie...
13: ...son to separate the chemical (material) dimension from the interpretive, symbolic or philosophical one...
17: ...uml;ve interpretations of some alchemists, or the fraudulent hopes fostered by others should not dimin...
19: ...istry, which provided a more precise and reliable framework for matter transmutations and medicine, wi... - Bronze Age (9344 bytes)
2: ...reas of the World. In most parts of subsaharan [[Africa]], the [[Neolithic]] is directly followed by t...
6: The date of the arrival of a Bronze Age varies from culture to culture.
9: ...Significant overlap in the cultures of the region from the preceding [[Chalcolithic]] Period make the ...
19: ...[Mediterranean]] bronze objects indicates it came from as far away as [[Britain]].
33: .... Some authorities speculate that a [[tsunami]] from Thera destroyed Cretan cities. Others say that... - Moon (37975 bytes)
6: ...ll.jpg|250px|none|The Moon as seen by an observer from Earth]]
7: <small><font color="white">The Moon as seen from Earth</font></small>
190: ...', the terms ''selene/seleno'' and ''cynthion'' (from the [[Lunar deity|Lunar deities]] [[Selene]] an...
192: The average distance from the Moon to the Earth is 384,403 [[kilometre]]s...
194: ...o 11]]. The first men sent ''to'' the Moon were [[Frank Borman]], [[Jim Lovell|James Lovell]] and [[Wi... - Americium (6956 bytes)
90: ...color="#ff99cc" | <font color="black">Most stable isotopes</font>
95: ! [[Isotope|iso]]
102: | <sup>241</sup>Am || [[synthetic radioisotope|{syn.}]]
123: ...t slowly tarnishes in dry air. [[Alpha emission]] from Am-241 is approximately three times [[radium]]....
126: ...nd uses in [[neutron radiography]]. However this isotope is extremely expensive to produce in usable quant... - Antimony (9093 bytes)
102: ! colspan="2" bgcolor="#cccc99" | Most stable isotopes
107: ! [[Isotope|iso]]
115: | colspan="4" | Sb is [[stable isotope|stable]] with 70 [[neutron]]s
120: | <sup>125</sup>Sb || [[synthetic radioisotope|{syn.}]]
133: ...ndance of antimony in the [[Earth]]'s crust range from 0.2 to 0.5 [[part per million|ppm]]. Antimony ... - Argon (6952 bytes)
30: {{Elementbox_isotopes_begin | isotopesof=argon | color1=#c0ffff | color2=green }}
31: {{Elementbox_isotopes_stable | mn=36 | sym=Ar | na=0.337% | n=18 }}
32: ...opes_decay | mn=37 | sym=Ar | na=[[synthetic radioisotope|syn]] | hl=35 [[day|d]] | dm=[[Electron capture|&...
33: {{Elementbox_isotopes_stable | mn=38 | sym=Ar | na=0.063% | n=20 }}
34: ...opes_decay | mn=39 | sym=Ar | na=[[synthetic radioisotope|syn]] | hl=[[1 E9 s|269]] [[year|y]] | dm=[[beta ... - Arsenic (12497 bytes)
96: ! colspan="2" bgcolor="#cccc99" | Most stable isotopes
101: ! [[Isotope|iso]]
109: | [[synthetic radioisotope|syn.]]
135: | colspan="4" | As is [[stable isotope|stable]] with 42 [[neutron]]s
146: ...nto the [[20th century]], as a [[pesticide]] on [[fruit tree]]s (resulting in neurological damage to t...
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