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Topic: Periodic table series


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In the News (Tue 23 Jul 19)

  
  Home page:The Extended Periodic Table Of The Elements
Such a series, which would be listed in a row below the actinide series in the periodic table, should consist of 32 elements, ending in the neighbourhood of element 153 and resulting primarily from the filling of the 5g and 6f inner electron shells.
The difficulty arises partly because of uncertainty of the exact point at which the energetically similar 5g and 6f orbitals begin to fill and partly because calculations indicate that the 8p and 7d orbitals may be very close in energy to the 5g and 6f orbitals.
The prediction of properties on the basis of an orderly extrapolation appears to be of doubtful validity, however, in this heavy-element region of the periodic table.
jeries.rihani.com   (1271 words)

  
  The Conventional Periodic Table of the Elements:
This version presents the two series in between the columns (groups) of the main body of the table, in an apparent effort to emphasize the non-existent relationship among the different groups and the two series.
From the previous examples, translated from the different sources cited for each table, one may observe the disorderly manner in which the Actinide Series and the Lanthanide Series of elements are placed upon the conventional periodic table.
Due to the disorderly manner in which the two series are presented, it is impossible to visualize specific relationships among the elements on the main body of the table in relation to these two series.
www.theschemata.com /conventional_periodic_table.html   (1465 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)

  
 periodic table — FactMonster.com
Periodic Table of the Elements: Beryllium - Periodic Table of the Elements: Beryllium 4 Be Beryllium 9.01218 2 · 2
Periodic Table of the Elements: Hydrogen - Periodic Table of the Elements: Hydrogen 1 H Hydrogen 1.00794 1
Periodic Table of the Elements: Boron - Periodic Table of the Elements: Boron 5 B Boron 10.81 2 · 3
www.factmonster.com /ce6/sci/A0838327.html   (759 words)

  
 Periodic table - Pharmpedia
The periodic table of the chemical elements, also called the Mendeleev periodic table, is a tabular display of the known chemical elements.
Mendeleev's discovery of the periodic table was one of the greatest developments in modern chemistry; chemists for the first time were able to quantitatively explain the behaviour of the elements and to predict the existence of undiscovered ones.
A group is a vertical column in the periodic table of the elements.
www.pharmpedia.com /Periodic_table   (1355 words)

  
 periodic table. The Columbia Encyclopedia, Sixth Edition. 2001-05
In the periodic table the elements are arranged in columns and rows according to increasing atomic number (see the table entitled Periodic Table).
This is in keeping with current interpretations of the periodic law which holds that the elements in a group have similar configurations of the outermost electron shells of their atoms.
The elements of a period are characterized by the fact that they have the same number of electron shells; the number of electrons in these shells, which equals the element’s atomic number, increases from left to right within each period.
www.bartleby.com /65/pe/periodtbl.html   (600 words)

  
 Kids.Net.Au - Encyclopedia > Periodic table   (Site not responding. Last check: )
The periodic table of the chemical elements is a display of the known chemical elements, arranged by electron structure so that many chemical properties vary regularly across the table.
The original table was created without a knowledge of the inner structure of atoms: if one orders the elements by atomic mass, and then plots certain other properties against atomic mass, one sees an undulation or periodicity to these properties as a function of atomic mass.
Despite their dramatic differences in mass within the group, their allotropes have very similar properties: They are all highly corrosive (meaning they combine readily with metals to form metal halide[?] salts); chlorine and fluorine are gases, while bromine is a very low-boiling liquid; chlorine and bromine at least are highly colored.
www.kids.net.au /encyclopedia-wiki/pe/Periodic_table   (541 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)

  
 Periodic Table - Trends
Periodic Law states that the properties of elements repeat ___________________ when the elements are arranged in ___________________ order by their atomic numbers.
Use the position in the periodic table to determine the number of valence electrons in the elements: Be, Ga, As, and F. 2c.
So far you have seen that the periodic table was organized to illustrate the repetitive nature of the properties of the elements.
www.avon-chemistry.com /p_table_lecture.html   (1745 words)

  
 The Periodic Table
Some of the families have historical names that pre-date the modern periodic table, since their chemical similarities were noted before the table was widely accepted.
The transition elements are the elements found in the middle region of the periodic table in a rectangle formed with the elements scandium, zinc, actinium, and ununbium at the corners.
Elements in this region of the periodic table are metals with less predictable properties with respect to the periodic properties.
www.chemprofessor.com /ptable.htm   (1143 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)

  
 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)

  
 MS Periodic Table
Period 4 is elements 19-36, starts with K (2, 8, 8, 1) and Ca (2, 8, 8, 2) and finishes with Kr Note that the number of shells containing electrons is equal to the period number.
The metals in the periodic table are mainly found in the left hand columns (Groups 1 and 2) and in the central blocks of the transition elements.
Period 2 starts with a solid low melting reactive metal lithium, in the middle there are the high melting and rather unreactive non-metals boron and carbon, next to the end is the very highly reactive non-metal gas fluorine, and the period finishes with the very unreactive gas neon.
homepage.mac.com /eannaoboyle/7sci/matter/ptablenotes.html   (1791 words)

  
 Periodic Table and Atomic Properties
Periodic Table - A tabular arrangement of elements in rows (periods) and columns (groups) in the order of their atomic numbers.
A period consists of the elements in any one horizontal row of the periodic table.
When the elements are arranged by atomic number in the periodic table, their physical and chemical properties vary periodically.
www.molecularsoft.com /data/help/Periodic_Table-Element_Properties.htm   (657 words)

  
 Periodic Table of the Elements
The periodic table was invented by the Russian chemist Dmitri Mendeleyev (1834-1907), which he published in Principles of Chemistry in 1869.
His periodic table arranged the 63 known chemical elements in order of their atomic mass.
Today, the elements in the periodic table are ordered by their atomic number.
periodictable.mysterymaster.com /report.html   (1316 words)

  
 The Periodic Table
Generally, within a given period, the chemical activity of metals increases with the group number, while the chemical activity of non-metals within a given period decreases with the group number.
The elements classified as "Rare Earth Elements" are located in Group 3 of the Periodic Table and in the 6th and 7th periods.
The standardised periodic table in use today was agreed by the International Union of Pure Applied Chemistry, IUPAC, in 1985 and now recognises more periods and elements than Dimitri Mendeleev knew in his day but still all fitting into his concept of the "Periodic Table".
www.periodic-table.org.uk /index.htm   (1042 words)

  
 Development of Periodic Table
The development of the periodic table begins with German chemist Johann Dobereiner (1780-1849) who grouped elements based on similarities.
Lord Rayleigh (1842-1919) and William Ramsey (1852-1916) greatly enhanced the periodic table by discovering the "inert gases." In 1895 Rayleigh reported the discovery of a new gaseous element named argon.
The last major change to the periodic table resulted from Glenn Seaborg's work in the middle of the 20th century.
mooni.fccj.org /~ethall/period/period.htm   (976 words)

  
 Lanthanide Series - Search Results - MSN Encarta
Lanthanide Series, series of metallic elements of the periodic table (Periodic Law) commonly defined as the elements cerium (atomic no. 58) through...
Cerium, Dysprosium, Erbium, Europium, Gadolinium, Holmium, Lanthanide Series, Lanthanum, Lutetium, Neodymium, Praseodymium, Promethium, Samarium,...
The lanthanides are located in block 5 d of the periodic table.
encarta.msn.com /Lanthanide_Series.html   (192 words)

  
 Alternative Periodic Table
The periodic table starts with a single row of two elements, followed by two rows of eight elements, followed by two rows of eighteen elements, followed by two rows of thirty-two elements.
Without knowing either where the table begins or where it ends, we couldn't know whether the inert gases belong at the ends of the rows, as we currently draw the table, or at the beginnings.
Likewise, the chemical "elements" listed in the periodic table are not actually elements of anything except the table itself and supersets of the non-empty subsets of the table.
home.att.net /~zei/TMKelso/periodic_table.htm   (2307 words)

  
 [No title]
In the periodic table, the elements are positioned in sequence, right to left, top to bottom, by their proton count.
Some light was shed on the reasons for the periodic table's predictive powers with the discovery of the tendency of atoms to move towards having eight electrons in their outer or valence shells.
Quantum Mechanics was able to explain the the reasons behind the number of elements in each period of the periodic table and even more amazingly, for all of us wishing to understand, explained why molecules bond as they do, particularly those very very long chains of elements that are the building blocks of life.
homepage.smc.edu /wissmann_paul/HuBiochemistry/1delaperiodictable.html   (3039 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)

  
 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)

  
 Into the Periodic Table, The Second Series - Jayesh Shah
The elements of the periodic table have found a place in everyday practice since the pioneering work of Jan Scholten.
In this seminar, I shared a series of cases where I had very good success with mineral remedies from the second series of the periodic table.
The mineral realm offers a myriad of remedies and a deep understanding of the periodic table is essential to the constitutional prescribing of the elements.
www.wholehealthnow.com /books/periodic-table-2.html   (374 words)

  
 Chemistry Resources at BPC: History of the Development of the Periodic Table of Elements
Before written history, people were aware of some the the elements in the periodic table.
This table unfortunately was not published until 1870, a year after Mendeleev's table was published.
Both the lanthanide and actinide series of elements were placed under the rest of the perioidc table.
www.bpc.edu /mathscience/chemistry/history_of_the_periodic_table.html   (615 words)

  
 Review of Periodic Trends
As one moves from down (↓) a group on the periodic table, the electronegativity of the elements encountered tends to:
As one moves from down (↓) a group on the periodic table, the ionization energy of the elements encountered tends to:
As one moves from down (↓) a group on the periodic table, the atomic radius of the elements encountered tends to:
www.sciencegeek.net /Chemistry/taters/Unit2PeriodicTrends.htm   (481 words)

  
 Alternative Periodic Tables
This is the familiar short form of the periodic table where the lanthanide and actinide elements are shown below the remainder of the table.
This is a 3-D periodic table constructed by Paul Giguere based primarily on the electronic structure of the atoms.
This is a periodic table constructed by Bruce Railsback that locates elements according their occurence as ions in nature, rather than according to the configuration of their outer-shell electrons in their elemental states based primarily on the electronic structure of the atoms.
www.wou.edu /las/physci/ch412/alttable.htm   (304 words)

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