bipolar vaporization
Group 1 of the periodic table of elements, is usually the sole element orphan, below which hydrogen is the group of six alkali metals: lithium, sodium, potassium, rubidium, cesium and francium. While the last three elements are extremely rare, and have little to do with everyday life, it is difficult to spend a day without finding at least one of the top three, in particular sodium, which is always found in table salt. Moreover, along with potassium, sodium is an important component of the human diet, and in compounds with other species, has an almost infinite number of uses. Although lithium has many applications, but for many people who have received at a drug for bipolar disorder, is literally a lifesaver.
Although there are extensive discussions on the relationship between electronic configuration and the definition of a particular collection of elements as a "family" in general chemistry books, it seems appropriate to touch on only lightly, to the extent that refers to the alkali metals. All members of Group 1 in the periodic table of elements have a valence electron configuration of ns1. This means that a single electron is involved in chemical bonds, and it moves through a single electron orbital, or range of probabilities, roughly corresponding to a sphere. Most elements bond according to what is known as the octet rule, meaning that when attached to two or more atoms, each has (or shares) eight valence electrons. It is for this reason that the noble gases, on the opposite side of the periodic table of alkali metals, almost never bond with other elements: they already have eight valence electrons. The alkali metals, on the other hand, are quite likely to find partners who want to ", and each has a single electron valence. This brings us to one of the reasons why the hydrogen, but is also considered part of Group 1, not included as an alkali metal. The first and most Obviously, there is a metal, in addition, that the bonds according to what is called the duet rule, so that shares two electrons with another element. Further, lacking of an electron to reach the stable configuration of helium can also be included with halogens.
The term "alkali" (essentially the opposite of an acid) refers to a substance that forms hydroxide ions in the negative charge (OH?) in contact with water. On its own, however, alkali metals almost always form positive ions, or cations, with a charge of +1. When alkali metals react with water, a hydrogen atom is separated from the water molecule to form hydrogen gas, while the hydrogen atom, oxygen joins others to form hydroxide. As for the heavier members family of alkali metal, reactions can often be so vigorous that the result is the burning or explosion. The alkali metals also react with oxygen to produce. Bright and soft to be cut with a knife, the alkali metals are usually white (although cesium is more of a yellowish white). When placed in a flame, most of these substances produce characteristic colors: lithium, for example, glows bright red, and sodium an intense yellow. Potassium heated produces a violet color, dark red rubidium, cesium and a blue light. This makes it possible to identify metals, when heated, color-a useful feature since they are so often tend to be linked with other elements.
As we move through the rows or periods of the periodic table, note that increases the mass of atoms, like the energy of each atom has. However, the amount of energy needed to turn a solid alkali metal in a liquid, or to vaporize a liquid alkali metal, actually decreases with higher atomic number. In other words, the higher the atomic number lower the boiling point and melting points.
About the Author:
Dr.Badruddin Khan teaches Chemistry in the University of Kashmir, Srinagar, India.
Article Source: ArticlesBase.com – Characteristics of the Alkali Metals
Porter – Bipolar
