Nitrogen group

Nitrogen group
Group 15
Period 2 Liquid nitrogen being poured
7
N
3 Some allotropes of phosphorus
15
P
4 Arsenic in metallic form
33
As
5 Antimony crystals
51
Sb
6 Bismuth crystals stripped of the oxide layer
83
Bi
7 115
Uup
A collection of nitrogen-group chemical element samples.

The nitrogen group is a periodic table group consisting of nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), bismuth (Bi) and ununpentium (Uup) (unconfirmed).

In modern IUPAC notation, it is called Group 15. In the old IUPAC and CAS systems, it was called Group VB and Group VA, respectively (pronounced "group five B" and "group five A", because "V" is a Roman numeral).[1] In the field of semiconductor physics, it is still universally called Group V.[2] It is also collectively named the pnictogens.[3] The "five" ("V") in the historical names comes from the fact that these elements have five valence electrons (see below).

Like other groups, the members of this family show patterns in its electron configuration, especially the outermost shells resulting in trends in chemical behavior:

Z Element No. of electrons/shell
7 nitrogen 2, 5
15 phosphorus 2, 8, 5
33 arsenic 2, 8, 18, 5
51 antimony 2, 8, 18, 18, 5
83 bismuth 2, 8, 18, 32, 18, 5
115 ununpentium 2, 8, 18, 32, 32, 18, 5

This group has the defining characteristic that all the component elements have 5 electrons in their outermost shell, that is 2 electrons in the s subshell and 3 unpaired electrons in the p subshell. They are therefore 3 electrons short of filling their outermost electron shell in their non-ionized state. The most important elements of this group are nitrogen (chemical symbol N), which in its diatomic form is the principal component of air, and phosphorus (P), which, like nitrogen, is essential to all known forms of life.

Binary compounds of the group can be referred to collectively as pnictides. The spelling derives from the Greek πνίγειν (pnígein), to choke or stifle, which is a property of nitrogen; it can also be used as a mnemonic for the two most common members, P and N. The name pentels (from Greek πέντε, pénte, five) was also used for this group at one time, stemming from the earlier group naming convention (Group VB).

These elements are also noted for their stability in compounds due to their tendency for forming double and triple covalent bonds. This is the property of these elements which leads to their potential toxicity, most evident in phosphorus, arsenic and antimony. When these substances react with various chemicals of the body, they create strong free radicals not easily processed by the liver, where they accumulate. Paradoxically it is this strong bonding which causes nitrogen and bismuth's reduced toxicity (when in molecules), as these form strong bonds with other atoms which are difficult to split, creating very unreactive molecules. For example N2, the diatomic form of nitrogen, is used for inert atmosphere in situations where argon or another noble gas would be prohibitively expensive.

The nitrogen group consists of two non-metals, two metalloids, one metal, and one synthetic (presumably metallic) element. All the elements in the group are a solid at room temperature except for nitrogen which is a gas at room temperature. Nitrogen and bismuth, despite both being part of the nitrogen group, are very different in their physical properties. For example, at STP nitrogen is a transparent nonmetallic gas, while bismuth is a brittle pinkish metallic solid.

See also

  • oxypnictide includes superconductors discovered in 2008
  • ferropnictide includes oxypnictide superconductors.

Notes

  1. ^ Fluck, E. New notations in the periodic table. Pure & App. Chem. 1988, 60, 431-436.[1]
  2. ^ For example, a 2005 book is titled Properties of group-IV, III-V and II-VI semiconductors.
  3. ^ Edited by N G Connelly and T Damhus (with R M Hartshorn and A T Hutton), ed (2005). Nomenclature of Inorganic Chemistry: IUPAC Recommendations 2005 section IR-3.5. ISBN 0-85404-438-8. http://www.iupac.org/publications/books/rbook/Red_Book_2005.pdf. 
Explanation of above periodic table slice:
Nonmetals Metalloids Poor metals atomic number in red are gases atomic number in black are solids solid borders are primordial elements (older than the Earth) dotted borders are radioactive, synthetic elements

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • nitrogen group — Five trivalent or quinquivalent elements whose hydrogen compounds are basic and whose oxyacids vary from monobasic to tetrabasic : nitrogen, phosphorus, arsenic, antimony, and bismuth …   Medical dictionary

  • nitrogen group element — ▪ chemical elements Introduction  any of the chemical elements that constitute Group Va of the periodic table (see Figure >). The group consists of nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi). The elements share… …   Universalium

  • Some properties of the nitrogen group elements — ▪ Table Some properties of the nitrogen group elements nitrogen phosphorus (white) atomic number 7 15 atomic weight 14.0067 30.9738 colour of element colourless white melting point (°C) −209.86 44.1 boiling point (°C) −195.8 280… …   Universalium

  • Nitrogen — carbon ← nitrogen → oxygen ↑ N ↓ P …   Wikipedia

  • Nitrogen washout — (or Fowler s method) is a test for measuring dead space in the lung during a respiratory cycle, as well as some parameters related to the closure of airways. Contents 1 Procedure 2 Parameters 3 See also 4 References …   Wikipedia

  • Nitrogen dioxide — Nitrogen dioxide …   Wikipedia

  • Nitrogen trifluoride — Nitrogen trifluoride …   Wikipedia

  • Nitrogen inversion — in ammonia Inversion of an amine. The pair of dots represents the lone electron pair on the nitrogen atom. In chemistry, a nitrogen compound like …   Wikipedia

  • nitrogen cycle — n a continuous series of natural processes by which nitrogen passes through successive stations in air, soil, and organisms and which principally involves nitrogen fixation, nitrification, decay, and denitrification * * * the steps by which… …   Medical dictionary

  • nitrogen mustard — n any of various toxic blistering compounds analogous to mustard gas but containing nitrogen instead of sulfur esp mechlorethamine * * * see chlormethine * * * 1. mechlorethamine hydrochloride. 2. any of a group of cytotoxic alkylating agents… …   Medical dictionary


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.