Group

Group may refer to:

Groups of people

  • Social group
  • Ethnic group
  • Organization, an entity that has a collective goal and is linked to an external environment

    • In science and technology

    In mathematics

  • Group (mathematics), a set together with a binary operation satisfying certain algebraic conditions

    • In chemistry

  • Functional group, a group of atoms which provide some property to a molecule
  • Group (periodic table), a column in the periodic table of chemical elements

    • In computing and the internet

  • Group (computing), a collection of users or other objects
  • Usenet newsgroup
  • Google Groups
  • Yahoo! Groups
  • Facebook groups

    • Other uses in science and technology

  • Group (stratigraphy), in geology, consisting of formations or rock strata
  • Cultivar group, in biology, a classification category in the International Code of Nomenclature for Cultivated Plants
  • Galaxy groups and clusters, in cosmology
  • Group (firearms), the grouping of shots from a firearm

    • Other uses

  • Breed Groups (dog), the group or category to which breeds of dogs are assigned by kennel clubs
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    This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Group

    Group (periodic table)

    In chemistry, a group (also known as a family) is a column of elements in the periodic table of the chemical elements. There are 18 numbered groups in the periodic table, but the f-block columns (between groups 2 and 3) are not numbered. The elements in a group have similar physical or chemical characteristics of the outermost electron shells of their atoms (i.e., the same core charge), as most chemical properties are dominated by the orbital location of the outermost electron. There are three systems of group numbering. The modern numbering group 1 to group 18 is recommended by the International Union of Pure and Applied Chemistry (IUPAC). It replaces two older naming schemes that were mutually confusing. Also, groups may be identified by their topmost element or have a specific name. For example, group 16 is variously described as oxygen group and chalcogen.

    CAS and old IUPAC numbering

    Two earlier group number systems exist: CAS (Chemical Abstracts Service) and old IUPAC. Both use numerals (Arabic or Roman) and letters A and B. Both systems agree on the numbers. The numbers indicate approximately the highest oxidation number of the elements in that group, and so indicate similar chemistry with other elements with the same numeral. The number proceeds in a linearly increasing fashion for the most part, once on the left of the table, and once on the right (see List of oxidation states of the elements), with some irregularities in the transition metals. However, the two systems use the letters differently. For example, potassium (K) has one valence electron. Therefore, it is located in group 1. Calcium (Ca) is in group 2, for it contains two valence electrons.

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    This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Group_(periodic_table)

    Shot grouping

    In shooting, a shot grouping, or simply grouping, is the placement of multiple shots on a target, the shots taken in one shooting session. The closeness of the grouping, the nearness of all the shots to each other, is a measure of the accuracy of a weapon, and a measure of the shooter's consistency and skill.

    Uses of the term

    For firearms that shoot one round at a time, a shot grouping can be used to measure the accuracy of the system comprised out of weapon as well as the precision and uniformity of the ammunition by fixing the weapon into position on a test mount, and aiming it at a target. Multiple shots using rounds from same type and batch are fired to observe how the weapon groups the shots. If a person holds the weapon and shoots it, the grouping measures the combination of the person's skill and the weapon's accuracy.

    In shotgun shooting, the grouping is also called the pattern. The pattern is the spread of shot from a single shotgun shell, measured as the smallest circle containing all the shots on the target. The barrel of a shotgun is designed to deliver a wide or narrow grouping, depending on the expected use. Shooting at close range indicates a cylinder bore barrel to deliver a wide grouping, while for hunting at longer distances such as 50 yards or meters, a choke is recommended for a tighter grouping.

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    This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Shot_grouping

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