Metalloids or Semimetals Definition, List, Properties

Between the metals and nonmetals is a group of elements known as either the semimetals or the metalloids, which are elements that have properties intermediate between those of the metals and nonmetals. Most metalloids have a shiny, metallic appearance but are brittle, unexceptional electrical conductors and display nonmetallic chemical properties. Metalloids have semiconductor properties and form amphoteric oxides. Location on the Periodic Table The metalloids or semimetals are located along the line between the  metals  and  nonmetals  in the  periodic table.  Because these elements have intermediate properties, its sort of a judgment call as to whether a particular element is a metalloid or should be assigned to one of the other groups. Youll find metalloids are classified differently in different classification systems, depending on the scientist or author. There is no single right way to divide the elements. List of Elements That Are Metalloids The metalloids are generally considered to be: BoronSiliconGermaniumArsenicAntimonyTelluriumPolonium (usually recognized, sometimes considered a metal)Astatine (sometimes recognized, otherwise seen as a halogen) Element 117, tennessine, has not been produced in sufficient amounts to verify its properties but is predicted to be a metalloid. Some scientists consider neighboring elements on the periodic table to either be metalloids or to have metalloid characteristics. An example is carbon, which may be considered either a nonmetal or a metalloid, depending on its allotrope. The diamond form of carbon looks and behaves as a nonmetal, while the graphite allotrope has a metallic luster and acts as an electrical semiconductor and so is a metalloid. Phosphorus and oxygen are other elements that have both nonmetallic and metalloid allotropes. Selenium is considered to be a metalloid in environmental chemistry. Other elements that may behave as metalloids under certain conditions are hydrogen, nitrogen, sulfur, tin, bismuth, zinc, gallium, iodine, lead, and radon. Properties of the Semimetals or Metalloids The electronegativities and ionization energies of the metalloids are between those of the metals and nonmetals, so the metalloids exhibit characteristics of both classes. Silicon, for example, possesses a metallic luster, yet it is an inefficient conductor and is brittle. The reactivity of the metalloids depends on the element with which they are reacting. For example, boron acts as a nonmetal when reacting with sodium yet as a metal when reacting with fluorine. The boiling points, melting points, and densities of the metalloids vary widely. The intermediate conductivity of metalloids means they tend to make good semiconductors. Commonalities Between Metalloids Here is a list of the properties common among metalloids: Electronegativities between those of metals and nonmetalsIonization energies between those of metals and nonmetalsPossession of some characteristics of metals, some of nonmetalsReactivity depending on the properties of the other elements in the reactionOften good semiconductorsOften having a metallic luster, although they may have allotropes that appear nonmetallicUsually behaving as nonmetals in chemical reactionsAbility to form alloys with metalsUsually brittleUsually solids under ordinary conditions Metalloid Facts A few interesting facts about several metalloids: The most abundant metalloid in Earths crust is silicon, which is the second most abundant element overall (oxygen is most abundant).The least abundant natural metalloid is tellurium.Metalloids are valuable in the electronics industry. Silicon, for example, is used to make the chips found in phones and computers.Arsenic and polonium are highly toxic metalloids.Antimony and tellurium are used primarily in metal alloys to add desirable properties.

Black Lives Matter A Movement Toward Systematic Equality

Black Lives Matter: A Movement Toward Systematic Equality Gomonnie Olegba Fortis College, Phoenix March 20, 2016 Introduction America is plagued by racial tension, a plight that this country is not unfamiliar with. Headlines of racial fueled riots and crimes flood news feeds from every journal, news paper, and blog. America as a whole has made monumental strides in equality since the Civil Rights Act of 1964 but systematically, African Americans are still experiencing injustice by the government and racism is still alive, it’s just underground. After a bounty of the unjustified murder of unarmed African American men, the Black Lives Matter Movement was created. A Malcom X quote that resonates in the†¦show more content†¦Some people contend that Black Lives Matter protestors and activists are wild thugs who are trying to intimidate and force their agenda on white people and as Daniel Greenfield put it,† tactics include harassing white people by invading â€Å"white spaces† and intimidating people tying to eat lunch. This is a racist attack to make whites leave the table.† S ome Caucasian people, as well as others try to justify their dismissal of the Black Lives Matter movement by claiming that it is a racist, anti-civil rights movement. On one hand, if white people mobbed the streets screaming racial slurs, then it would be labeled immediately as utter racism, and swiftly punished. On the other hand, since black people are mobbing the streets, screaming racial slurs, it is considered beautiful and â€Å"praised as a civil rights movement.† Greenfield also adds, â€Å"Racism is not civil rights. No group that talks about white supremacy or white privilege is a civil rights movement. Black racism hides behind alleged victimhood and the racist term â€Å"white privilege† is classic racism.† The Black Lives Matter movement came into effect because of the historic oppression experienced by African Americans, the police brutality, along with the innocent victims that were murdered by their hands and the refusal of white America to recog nize the injustice that African Americans as a whole sustain. History of Black Oppression and the

Issues with Social Development in Adults Free Essays

In my research on issues of social development in adults, I found change and consistency in social participation plays a key role in early adulthood. I felt the need to choose and touch on this topic because I have the tendency to be a social butterfly and I also lost a dear friend that committed suicide from social isolation. I chose this article because after reading it I felt as if the information was solid and backed up with surveys and facts. We will write a custom essay sample on Issues with Social Development in Adults or any similar topic only for you Order Now I also felt as if the topic was thoroughly examined and the article gave a lot of helpful information about this particular issue with social development in adults. Social interactions and activities play a key role in the physical health and well being in adulthood. It is healthy and fun to be around friends, loved ones, and even relationship partners. Making plans, going out, and being social gives one the since of self worth. Further more, the lack of desire and absence of social contact and participation can cause one, such as in the incident of my friend, to become depressed, self-isolated, and have suicidal thoughts and/or even commit suicide. In the event that I would need to write a research paper on this topic, I would use this article. I would use the article because it has a lot of information about the topic and has many different details and survey information. This would all help my research and provide me with information to include in my paper. The authors, Harry Reis and Yi-Cheng Lin, research was to determine if age-related changes in social relationships and to see if interaction patterns would stay the same from college years to adult- hood. They researched a variety of different things like opposite-sex socializing, intimacy and satisfaction in adulthood, and implications for social development during early adulthood. How to cite Issues with Social Development in Adults, Papers