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Topic: Periodic table


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In the News (Mon 22 Apr 19)

  
  Chemistry: WebElements Periodic Table
The periodic "law" of chemistry recognises that many properties of the chemical elements are periodic functions of their atomic number (the number of protons within the element's atomic nucleus).
The periodic table is an arrangement of the chemical elements ordered by atomic number in columns (groups) and rows (periods) presented so as to emphasize their periodic properties.
The relative merits of various other periodic table organisations is still the subject of debate.
www.webelements.com   (426 words)

  
  Periodic Table - MSN Encarta
Periodic Table, table of the chemical elements arranged to illustrate patterns of recurring chemical and physical properties.
The periodic table has been published in various shapes and sizes, but the most commonly used modern form begins with a column of group 1 metals on the left-hand side, followed by a column of group 2 alkaline earth metals.
A number of chemists contributed to the development of the periodic table during the 19th century; however, Mendeleyev is regarded as the primary discoverer.
encarta.msn.com /encyclopedia_761586387/Periodic_Table.html   (1194 words)

  
  Periodic table - Wikipedia, the free encyclopedia
The periodic table of the chemical elements is a tabular method of displaying the chemical elements, first devised in 1869 by the Russian chemist Dmitri Mendeleev.
The periodic table is now ubiquitous within the academic discipline of chemistry, providing an extremely useful framework to classify, systematize and compare all the many different forms of chemical behavior.
A period is a horizontal row in the periodic table of the elements.
en.wikipedia.org /wiki/Periodic_table   (2217 words)

  
 Periodic Table - Model Science Software
His periodic law states that the chemical and physical properties of the elements vary in a periodic way with their atomic weights.
The 38 elements in groups 3 through 12 of the periodic table are called "transition metals." As with all metals, the transition elements are both ductile and malleable, and conduct electricity and heat.
All of the rare earth metals are found in group 3 of the periodic table, and the 6th and 7th periods.
modelscience.com /PeriodicTable.html   (571 words)

  
 The Periodic Table
A necessary prerequisite to the construction of the periodic table was the discovery of the individual elements.
In 1898, William Ramsey suggested that argon be placed into the periodic table between chlorine and potassium in a family with helium, despite the fact that argon's atomic weight was greater than that of potassium.
Although Mendeleev's table demonstrated the periodic nature of the elements, it remained for the discoveries of scientists of the 20th Century to explain why the properties of the elements recur periodically.
www.wou.edu /las/physci/ch412/perhist.htm   (1833 words)

  
 The Periodic Table(Page 1)
In a revision of his table in 1871 he arranged some elements and proposed a table of eight columns, obtained by splitting each of the long periods into a period of seven elements, an eighth group containing the three central elements (such as Fe, Co, Ni), and a second period of seven elements.
The first and second periods of seven were later distinguished by use of the letters a and b attached to the group symbols, which are Roman numerals.
Periods 4 and 5 are long periods of 18 each, while period 6 has 32 elements, and period 7 is incomplete with only 17 elements most of which are radioactive and do not occur in nature.
www.ruf.rice.edu /~sandyb/Lessons/chem.html   (1237 words)

  
 Teachers' Domain: Periodic Table of the Elements
At first glance, the periodic table -- that chart that appears on the walls of science classrooms everywhere -- appears to be an oddly shaped collection of chemical information about the elements.
A closer look, however, reveals the source of the table's name: The elements are arranged "periodically;" that is, according to properties that repeat in regular, predictable patterns.
Elements are arranged in the periodic table according to atomic number, from left to right, top to bottom.
www.teachersdomain.org /6-8/sci/phys/matter/ptable/index.html   (1108 words)

  
 EIA Kids Page - A Periodic Table of the Elements
The periodic table is the most important reference a chemist has because it puts all the known elements into a meaningful pattern.
The period number of an element signifies the highest energy level an electron in that element occupies (in the unexcited state).
The number of elements in a period increases as one moves down the periodic table because as the energy level of the atom increases, the number of energy sub-levels per energy level increases.
www.eia.doe.gov /kids/energyfacts/science/periodictable.html   (199 words)

  
 Facts about the Periodic Table
Dimitri Mendeleev, the father and inventor, of the Periodic Table, was born on February 7, 1834 in Tobolsk, Siberia in Russia.
Mendeleev then went further, using the remaining gaps and spaces in his periodic table, he correctly concluded that a group of yet unknown elements must exist to fill in the gaps in the Periodic Table, this was the group we now know as the lanthanides.
Fifty years after Dimitri Mendeleev created the Periodic table, the British scientist Henry Moseley discovered that the number of protons in the nucleus of a particular type of atom was always the same.
www.facts-about.org.uk /science-periodic-table.htm   (579 words)

  
 The Periodic Table
The periodic table is divided into three main sections: the metals, the nonmetals, and the metalloids.
These are the elements in the second column of the periodic table, and they are very similar to the alkali metals.
Row six of the periodic table is the ____________.
www.chem.lsu.edu /lucid/tutorials/Periodic_Table.html   (531 words)

  
 Open Directory - Science: Chemistry: Periodic Table   (Site not responding. Last check: )
David's Whizzy Periodic Table - Applet-based table with visualizations of the electron shell model, the nucleus, the visual emission spectrum, and energy levels of the electrons.
Periodic table - Printable Interactive periodic table of the elements, chemistry data tables and pictures of elements.
Periodic Table of the Elements - [Basic data, includes printable version] Information on each of the chemical elements and data on their properties.
dmoz.org /Science/Chemistry/Periodic_Table   (1497 words)

  
 Periodic Table
See also essay on the periodic table, a chart of the chemical elements, and the science section of the Homework Center.
The nature of things: attempts to change the periodic table raise eyebrows.
The Periodic Table: Its Story and Its Significance.(Books: A selection of a new and notable books of scientific interest)(Brief article)(Book......
www.infoplease.com /periodictable.php   (109 words)

  
 Periodic Tables   (Site not responding. Last check: )
The Periodic Table of the Elements Groton HS Periodic Table (Hardcorp)
Periodic Table of the Elements University of Colorado
Periodic Table The Periodic Table By: Levi, Primo
www.chemistrycoach.com /periodic_tables.htm   (1659 words)

  
 Inorganic Chemistry Resources
Periodic trends in the radii of elements and their ions are a common topic in general and more advanced inorganic chemistry courses.
As an inorganic chemist I like to think of the periodic table as three dimensional, involving both elements and their oxidation states.
There are two buttons that color the atoms by the sections of the periodic table, but do not differentiate by atomic charge.
www.wsu.edu /~wherland   (463 words)

  
 periodic table   (Site not responding. Last check: )
The periodic table is a classification scheme of the elements.
The periodic table is constructed in a way that reflects the distribution of electrons in the atoms of the elements.
One reason that the periodic table is valuable, is that there are many patterns in it that allow a knowledgeable person to use it as a tool.
cuip.uchicago.edu /www4teach/97/crothe/periodictable.html   (742 words)

  
 Synergy Creations - Periodic Table
The periodic table--the cornerstone of chemistry--expresses in a compact form the relationships between all the elements in the universe.
Synergy Creations' Periodic Table 4 is a versatile chemistry reference tool for your Macintosh that takes the periodic table beyond the simple paper periodic table found in so many textbooks and classrooms.
Periodic Table on CD is available for $40, shipping included.
www.synergycreations.com /periodic/index.html   (506 words)

  
 Simple Periodic Table - School for Champions: Succeed in Physical Science
The Periodic Table is a helpful arrangement of the elements according to both their atomic number and the number of electrons in the outer orbit.
The Periodic Table is a very powerful tool for studying the elements and how they combine.
The Periodic Table arranges elements according to their atomic number and the number of electrons in the outer orbit.
www.school-for-champions.com /science/chemperiodic.htm   (1260 words)

  
 Lesson 3-4 The Periodic Table
The average person can see that the table shows the atomic number and atomic mass of each element, but a student of Chemistry learns that there is much more there, for someone who knows how to read the table correctly.
By looking at the period that the element is found in, you can determine the energy level which the valence shell is found.
Oxygen (O) is found in the second period, and in the fourth column of the p section.
www.fordhamprep.org /gcurran/sho/sho/lessons/lesson34.htm   (1058 words)

  
 C&EN: IT'S ELEMENTAL: THE PERIODIC TABLE - INTRODUCTION
To chemists, however, the periodic table reveals the organizing principles of matter, which is to say, the organizing principles of chemistry.
There are no atomic numbers on Mendeleyev’s periodic table, only atomic weights and the groupings of elements based on their known properties.
The periodic table is so central to chemistry that it seemed natural to devote a special issue to it and the elements that compose it as we celebrate CandEN’s 80th anniversary.
pubs.acs.org /cen/80th/elements.html   (487 words)

  
 Detailed Periodic Table - School for Champions: Succeed in Physical Science   (Site not responding. Last check: )
The introduction to the Periodic Table explained how the elements are arranged according to their atomic number and the number of electrons in the outer orbit.
The elements in the following Periodic Table are arranged in rows according to atomic number and in columns according to the configuration of the outer orbit.
Elements to the left of the semiconductors on the table are considered metals.
www.school-for-champions.com /science/chemperiodic2.htm   (780 words)

  
 Periodic Table by Theodore Gray   (Site not responding. Last check: )
It joins Theo's elegant, innovative, and of course angular "Triangle Table." The Periodic Table was trickier to construct, due to sources disagreeing on the melting point of iron and such.
If anyone has any samples of unusual elements that they would like to contribute to the table, or if they know of any simple methods for the extraction of said samples, Ed would love to hear from you.
A picture poster Periodic Table was made by Jensan Scientifics.
www.mathpuzzle.com /Periodic.htm   (255 words)

  
 Periodic Table
Dimitri Mendeleev was one of the first to publish a table using these properties to arrange the elements.
Periodic Law: “When elements are arranged in order of increasing atomic weight their properties are repeated periodically.” This idea of repetition of properties is one of the most important milestones in chemistry.
The electron cloud is pulled inward due to an increase in the nuclear charge (the attractive force of the positively charged nucleus for the negatively charged electron cloud.) The more protons, the stronger the nuclear charge.
www.sciencebyjones.com /periodic_table1.htm   (1207 words)

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