Metalloid

A metalloid is a chemical element with properties in between, or that are a mixture of, those of metals and nonmetals. There is no standard definition of a metalloid, nor is there complete agreement as to which elements are appropriately classified as such. Despite this lack of specificity, the term remains in use in the literature of chemistry.

The six commonly recognised metalloids are boron, silicon, germanium, arsenic, antimony, and tellurium. Elements less commonly recognised as metalloids include carbon, aluminium, selenium, polonium, and astatine. On a standard periodic table all of these elements may be found in a diagonal region of the p-block, extending from boron at one end, to astatine at the other. Some periodic tables include a dividing line between metals and nonmetals and the metalloids may be found close to this line.

Typical metalloids have a metallic appearance, but they are brittle and only fair conductors of electricity. Chemically, they mostly behave as nonmetals. They can form alloys with metals. Most of their other physical and chemical properties are intermediate in nature. Metalloids are usually too brittle to have any structural uses. They and their compounds are used in alloys, biological agents, catalysts, flame retardants, glasses, optical storage and optoelectronics, pyrotechnics, semiconductors, and electronics.

Periodic table

The periodic table is a tabular arrangement of the chemical elements, ordered by their atomic number (number of protons), electron configurations, and recurring chemical properties. This ordering shows periodic trends, such as elements with similar behavior in the same column. It also shows four rectangular blocks with some approximately similar chemical properties. In general, within one row (period) the elements are metals on the lefthand side, and non-metals on the righthand side.

The rows of the table are called periods; the columns are called groups. Six groups (columns) have names as well as numbers: for example, group 17 elements are the halogens; and group 18, the noble gases. The periodic table can be used to derive relationships between the properties of the elements, and predict the properties of new elements yet to be discovered or synthesized. The periodic table provides a useful framework for analyzing chemical behavior, and is widely used in chemistry and other sciences.

Keke Palmer discography

The discography of Keke Palmer, an American R&B singer-songwriter, consists of one studio album, one extended play, three mixtapes and seven singles. In 2005, Palmer signed a record deal with Atlantic Records. Palmer released her debut album So Uncool on September 18, 2007. The album failed to chart on the US Billboard 200, but did chart at number 85 on the R&B chart. The album was preceded by the lead single "Keep It Movin'". In 2010, Palmer was signed by the Chairman of Interscope Records, Jimmy Iovine, and began working on an album.

In January 2011, Palmer released her first mixtape Awaken. The mixtape was officially released on January 10, 2011, for downloads on mixtape-downloading websites. The first and only single released from the mixtape was "The One You Call". A music video was also released for the song. In July 2012, Palmer released the single "You Got Me" featuring Kevin McCall. The video for the single was released on July 11, 2012. Palmer released a self-titled mixtape Keke Palmer on October 1, 2012. It includes her new singles "You Got Me" & "Dance Alone" which have already been released. On May 16, 2013, Keke Palmer released a video showing her recording and performing a cover of Alicia Keys song "If I Ain't Got You".

I Am

I Am may refer to:

Music

Albums

Songs