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- Periodic table (7298 bytes)
1: ...bular display of the known [[chemical element]]s. First created by [[Dmitri Mendeleev]], the elements ...
6: ...riodic table. Elements in a group have similar configurations of their [[valence shell]] electrons, wh...
9: ...nion of Pure and Applied Chemistry]] (IUPAC). The IUPAC scheme was developed to replace both older Roman ...
21: ...iodic table (electron configurations)|Electron Configurations]]
23: *[[Periodic table (block)|Periodic table filled by blocks]] - List of elements by symbol (14812 bytes)
1: ==Symbols currently recognized by [[IUPAC]]==
127: ...iven at one time to an isotope of [[radon]] identified in the decay chain of [[actinium]].</td></tr>
145: ...en at one time to an isotope of [[thorium]] identified in the decay chain of [[uranium]].</td></tr>
164: ...iven at one time to an isotope of [[radon]] identified in the decay chain of [[thorium]].</td></tr>
189: ...rg/reports/1998/7001coplen/history.pdf History of IUPAC Atomic Weight Values (1883 to 1997)] - Chemistry (12553 bytes)
9: ...eral main cross-disciplinary and more specialized fields of chemistry.
21: ; Other fields : [[Astrochemistry]], [[Atmospheric chemistry...
28: ...rding to the [[inorganic nomenclature]] system. [[IUPAC nomenclature]]
47: A [[Chemical compound]] is a substance with a ''fixed ratio'' of [[element]]s which determines the c...
66: ... the phase. The [[phase | phase of matter]] is defined by the ''phase transition'', which is when ene... - Wilhelm Conrad Roentgen (8624 bytes)
2: ...erman spelling) in English; therefore most scientific and medical references to him are found under th...
12: ...rt time and he was one of the few pioneers in the field who used protective lead shields routinely.
16: ...aluminium from damage by the strong electrostatic field that is necessary to produce the cathode rays....
20: ...he weekend to repeat his experiments and make his first notes. In the following weeks he ate and slep...
22: ... the significance of their discovery, filed their film for further reference, and thereby lost the opp... - Chemical element (8169 bytes)
3: ... mass]] of an element, ''A'', is measured in [[unified atomic mass unit]]s (u) and is roughly equal to...
5: ...l the heavier elements are made naturally and artificially through various methods of [[nucleosynthesi...
7: ...uch element being [[Technetium]] in 1937. All artificially derived elements are radioactive with short...
17: ...t be expected to use the IUPAC name. According to IUPAC, the full name of an element is not capitalized, ...
19: ... to ever be sold in bulk. These are also named by IUPAC, which generally adopts the name chosen by the di... - Atomic mass (3063 bytes)
3: ...pe is approximately an integer: in most cases the first digit after the decimal point is 0 or 9. This ...
5: ...lement heavier than [[iron]] produces energy, and fission in any element lighter than iron requires en...
9: ...e term '''standard atomic weight''' (as used by [[IUPAC]] at this time) refers to the mean relative atomi...
11: A similar definition applies to [[molecule]]s; it is then called... - Bohrium (3577 bytes)
31: | [[Electron configuration]]
46: ...y Ion Research) at Darmstadt were also able to confirm the Soviet team's results and produce bohrium, ...
50: ...lements from 101 to 109 were to be called; thus [[IUPAC]] adopted unnilseptium (symbol Uns) as a temporar...
51: In [[1994]] a committee of IUPAC recommended that element 107 be named bohrium. - Caesium (11026 bytes)
42: | [[Electron configuration]]
85: | [[Specific heat capacity]]
146: ...]], but ''caesium'' is the spelling used by the [[IUPAC]], although since [[1993]] it has recognized ''ce...
149: ...[francium]]. Caesium is the least abundant of the five non-radioactive alkali metals. (Technically, [...
154: ...he [[second]], on the properties of caesium. SI defines the [[second]] as 9,192,631,770 cycles of the ... - Darmstadtium (3185 bytes)
23: |[[Electron configuration]]||probably <nowiki>[</nowiki>[[radon|Rn]...
33: It was [[discovery of the chemical elements|first created]] on [[November 9]], [[1994]] at the [...
35: ...Darmstadt). The new name was given to it by the [[IUPAC]] in [[August]] [[2003]].
40: ...//www.iupac.org/news/archives/2003/naming110.html IUPAC: Element 110 is named darmstadtium] - Dubnium (4200 bytes)
30: | [[Electron configuration]]
43: ...ty of California, Berkeley]] had positively identified element 105.
47: ...ater tried to confirm the [[Soviet Union|Soviet]] findings using more sophisticated methods but were n...
49: ...ernational Union of Pure and Applied Chemistry]] (IUPAC) thus adopted ''unnilpentium'' (symbol Unp) as a ... - Hassium (3205 bytes)
26: <td>[[Electron configuration]] </td><td>probably...
37: It was [[discovery of the chemical elements|first synthesized]] in [[1984]] by a German research...
39: ...name for this element. In [[1994]] a committee of IUPAC recommended that element 108 be named hahnium. - Hydrogen (20221 bytes)
36: <td>[[Electron configuration]] </td><td>1s<sup>1...
69: <td>[[Specific heat capacity]] </td><td>1...
110: ...a simple method, but it is still economically inefficient for mass production. Scientists are now rese...
130: ...) of hydrogen, is used in [[CANDU reactor|nuclear fission applications]] as a [[neutron moderator|mode...
138: ...r was made of hydrogen and [[oxygen]]. One of its first uses was for [[balloon]]s. The hydrogen was ob... - Lawrencium (5210 bytes)
24: <td>[[Electron configuration]] </td><td>probably...
34: ...ely silvery-white or gray and [[metal]]lic. If sufficient amounts of lawrencium were produced, it woul...
43: ...cium decay via [[alpha emission]], [[spontaneous fission]] and [[electron capture]] (in order of most...
45: ...Union of Pure and Applied Chemistry]] (IUPAC) ratified the name lawrencium and symbol Lr during a meet... - Aluminium (26079 bytes)
6: {{Elementbox_econfig | [[[neon|Ne]]] 3s<sup>2</sup> 3p<sup>1<...
71: ...able to further oxidation, and is used in various fields of construction.
82: ...ted, he ordered him to be beheaded.'' [http://www.findarticles.com/p/articles/mi_m2843/is_n3_v19/ai_16...
84: ...um 'alumine'. In [[1808]], [[Humphry Davy]] identified the existence of a metal base of alum, which he...
86: ...ium. However, the metal had been produced for the first time two years earlier in an impure form by th... - Meitnerium (3364 bytes)
29: <td>[[Electron configuration]] </td><td>probably...
39: ...itnerium was [[discovery of the chemical elements|first synthesized]] on [[August 29]], [[1982]] by a ...
42: ...lements from 101 to 109 were to be called; thus [[IUPAC]] adopted [[unnilennium]] (symbol Une) as a tempo... - Niobium (10560 bytes)
45: | [[Electron configuration]]
69: | 10.83 [[scientific notation|×]]10<sup>-6</sup> [[cubic metre ...
88: | [[Specific heat capacity]]
164: ...iety of columbite (now called niobite) and was at first named after this mineral.
176: ...ure cross-section for thermal [[neutron]]s and so finds use in the nuclear industries. - Roentgenium (3150 bytes)
23: |[[Electron configuration]]||probably <nowiki>[</nowiki>[[radon|Rn]...
33: It was [[discovery of the chemical elements|first created]] at the [[Gesellschaft f?werionenfors...
35: ...date, the element was known under the temporary [[IUPAC]] [[systematic element name]] ''unununium''. Some... - Rutherfordium (3808 bytes)
31: | [[Electron configuration]]
42: ...nd little is known about it. Rutherfordium is the first [[transactinide element]] and it is predicted ...
45: ...s reportedly [[discovery of the chemical elements|first synthesized]] in [[1964]] at the Joint Nuclear...
46: ...[[ion]]s and claimed that they detected [[nuclear fission]] tracks in a special type of glass with a [...
51: ...troversy]]; Since the Soviets claimed that it was first detected in Dubna, Dubnium (Db) was suggested,... - Seaborgium (4376 bytes)
25: <td>[[Electron configuration]]</td><td>probably <nowiki>[</nowiki>[[ra...
37: Because their work was independently confirmed first, the Americans suggested the name seaborgium t...
41: ...nt naming controversy]] erupted and as a result [[IUPAC]] adopted ''unnilhexium'' (symbol Unh) as a tempo...
42: ...n be named after a living person. This ruling was fiercely objected to by the [[American Chemical Soci...
45: ... which decays through alpha decay and spontaneous fission. It has a half-life of 2.9 [[milliseconds|ms... - Sulfur (18059 bytes)
6: {{Elementbox_econfig | [[[neon|Ne]]] 3s<sup>2</sup> 3p<sup>4<...
45: ..., it can be found as the pure element or as [[sulfide]] and [[sulfate]] minerals. It is an essential...
48: ...water but [[solubility|soluble]] in [[carbon disulfide]] and other nonpolar solvents. Common [[oxidati...
50: ...ygen]] only exists in two states of chemical significance: O<sub>2</sub> and O<sub>3</sub>. [[Selenium...
52: ...phy]] of sulfur is complex. Depending on the specific conditions, the sulfur [[allotrope|allotropes]] ...
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