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Group 9 element
 
 
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In modern IUPAC nomenclature, Group 9 of the periodic table
Periodic table

The periodic table of the chemical elements is a table method of displaying the chemical elements. Although precursors to this table exist, its invention is generally credited to Russian chemist Dmitri Mendeleev in 1869....
 contains the elements
Chemical element

A chemical element is a type of atom that is distinguished by its atomic number; that is, by the number of protons in its atomic nucleus. The term is also used to refer to a pure chemical Chemical substance composed of atoms with the same number of protons....
  cobalt
Cobalt

Cobalt is a hard, lustrous, grey metal, a chemical element with symbol Co and atomic number 27. Although cobalt-based colors and pigments have been used since ancient times, and miners have long used the name kobold ore for some minerals, cobalt was only discovered in 1735 by Georg Brandt....
  (Co), rhodium
Rhodium

Rhodium is a chemical element that is a rare, silvery-white, hard transition metal and a member of the platinum group. Rhodium is found in platinum ores and is used in alloys with platinum and as a catalyst....
  (Rh), iridium
Iridium

Iridium is the chemical element with atomic number 77, and is represented by the symbol Ir. A very hard, brittle, silvery-white transition metal of the platinum group, iridium is the second densest element and is the most corrosion-resistant metal, even at temperatures as high as 2000 ?C....
  (Ir), and meitnerium
Meitnerium

Meitnerium is a chemical element in the periodic table that has the symbol Mt and atomic number 109.Mt is a synthetic element whose most stable isotope, Mt-278, has a predicted half-life of a half-hour....
  (Mt). These are all d-block
D-block

The d-block of the periodic table consists of those periodic table groups that contain elements in which, in the atomic ground state, the highest-energy electron is in a d-atomic orbital....
 transition metal
Transition metal

In chemistry, the term transition metal has two possible meanings:*It commonly refers to any element in the d-block of the periodic table, including the group 12 element elements zinc, cadmium and Mercury ....
s. All known isotopes of Mt are radioactive with short half-lives, and it is not known to occur in nature; only minute quantities have been synthesized in laboratories.

Like other groups, the members of this family show patterns in its electron configuration
Electron configuration

In atomic physics and quantum chemistry, electron configuration is the arrangement of electrons in an atom, molecule, or other physical structure....
, especially the outermost shells resulting in trends in chemical behavior, though rhodium curiously does not follow the pattern:








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In modern IUPAC nomenclature, Group 9 of the periodic table
Periodic table

The periodic table of the chemical elements is a table method of displaying the chemical elements. Although precursors to this table exist, its invention is generally credited to Russian chemist Dmitri Mendeleev in 1869....
 contains the elements
Chemical element

A chemical element is a type of atom that is distinguished by its atomic number; that is, by the number of protons in its atomic nucleus. The term is also used to refer to a pure chemical Chemical substance composed of atoms with the same number of protons....
  cobalt
Cobalt

Cobalt is a hard, lustrous, grey metal, a chemical element with symbol Co and atomic number 27. Although cobalt-based colors and pigments have been used since ancient times, and miners have long used the name kobold ore for some minerals, cobalt was only discovered in 1735 by Georg Brandt....
  (Co), rhodium
Rhodium

Rhodium is a chemical element that is a rare, silvery-white, hard transition metal and a member of the platinum group. Rhodium is found in platinum ores and is used in alloys with platinum and as a catalyst....
  (Rh), iridium
Iridium

Iridium is the chemical element with atomic number 77, and is represented by the symbol Ir. A very hard, brittle, silvery-white transition metal of the platinum group, iridium is the second densest element and is the most corrosion-resistant metal, even at temperatures as high as 2000 ?C....
  (Ir), and meitnerium
Meitnerium

Meitnerium is a chemical element in the periodic table that has the symbol Mt and atomic number 109.Mt is a synthetic element whose most stable isotope, Mt-278, has a predicted half-life of a half-hour....
  (Mt). These are all d-block
D-block

The d-block of the periodic table consists of those periodic table groups that contain elements in which, in the atomic ground state, the highest-energy electron is in a d-atomic orbital....
 transition metal
Transition metal

In chemistry, the term transition metal has two possible meanings:*It commonly refers to any element in the d-block of the periodic table, including the group 12 element elements zinc, cadmium and Mercury ....
s. All known isotopes of Mt are radioactive with short half-lives, and it is not known to occur in nature; only minute quantities have been synthesized in laboratories.

Like other groups, the members of this family show patterns in its electron configuration
Electron configuration

In atomic physics and quantum chemistry, electron configuration is the arrangement of electrons in an atom, molecule, or other physical structure....
, especially the outermost shells resulting in trends in chemical behavior, though rhodium curiously does not follow the pattern:

Z
Atomic number

In chemistry and physics, the atomic number is the number of protons found in the atomic nucleus of an atom. It is conventionally represented by the symbol Z....
 		 Element
Element

The name element may refer to:In chemistry, electronics or the geosciences:* Chemical element, an atomic structure* Electrical element...
 		 No. of electrons/shell
Electron shell

File:Periodic Table of Elements showing Electron Shells.svgAn electron shell may be crudely thought of as an orbit followed by electrons around an atom Atomic nucleus....
27 cobalt 2, 8, 15, 2
45 rhodium 2, 8, 18, 16, 1
77 iridium 2, 8, 18, 32, 15, 2
109 meitnerium 2, 8, 18, 32, 32, 15, 2


Applications

  • Alloys with other metals, primarially to add corrosion and wear resistance
  • Industrial Catalysts
  • Superalloys
  • Electrical Components


See also

  • Platinum group
    Platinum group

    The platinum group metals sometimes collectively refers to six metallic chemical element clustered together in the periodic table.These elements are all transition metals, lying in the d-block ....
>Explanation of right side periodic table slice:Transition metal
Transition metal

In chemistry, the term transition metal has two possible meanings:*It commonly refers to any element in the d-block of the periodic table, including the group 12 element elements zinc, cadmium and Mercury ....
s 		atomic number in black are solidssolid borders are older than the Earth
Earth

Earth is the third planet from the Sun. Earth is the largest of the terrestrial planets in the Solar System in diameter, mass and density. It is also referred to as the World and Wiktionary:Terra.Note that by International Astronomical Union convention, the term "Terra" is used for naming extensive land masses, rather...
 (Primordial elements)		dashed borders have no isotopes older than the earth
Category:Periodic table