Polonium Facts - Elements Are Interesting

Polonium Facts - Elements Are Interesting Polonium is a rare radioactive semi-metal or metalloid. The toxic element is believed to have caused the death of former intelligence agent, Alexander Litvinenko, in November 2006. Polonium is a radioactive element that occurs naturally in the environment at very low levels or can be produced in a nuclear reactor. PhysicalProperties of Polonium Polonium-210 emits alpha particles, which can damage or destroy genetic material inside of cells. Isotopes that emit alpha particles are toxic if they are ingested or inhaled because the alpha particles are very reactive, but polonium isnt absorbed through the skin, nor does the alpha radiation penetrate deeply. Polonium generally is considered toxic only if taken internally (breathing, eating, through an open wound). Marie and Pierre Curie discovered polonium in 1897.  Marie Curie  named polonium for her homeland, Poland. Polonium dissolves readily in dilute acids. Po-210 readily becomes airborne and is soluble enough to circulate through body tissues.  Polonium is the only component of cigarette smoke to produce cancer in laboratory animals. The polonium in tobacco is absorbed from phosphate fertilizers. A lethal amount of ingested polonium is 0.03 microcuries, which is a particle weighing 6.8 x 10-12 g (very small). Pure polonium is a silvery-colored solid. Mixed or alloyed with beryllium, polonium can be used as a portable neutron source. Polonium is used as a neutron trigger for nuclear weapons, in making photographic plates, and to reduce static charges in industrial applications such as textile mills.

How to Add Emphasis to Your Writing

How to Add Emphasis to Your Writing How to Add Emphasis to Your Writing How to Add Emphasis to Your Writing By Mark Nichol Some people consider italics and boldface type and quotation marks, when they’re used other than as dialogue markers to be just so many noisy bells and whistles. They often are, when they’re misused, but when they’re employed correctly and strategically, they send strong signals. The following rules apply primarily for books and magazines. 1. Italics Italics, based on handwriting script, serve several functions. They identify the titles of stand-alone creative works like books, films and television series, and paintings. But parts of compositions chapters, episodes of TV shows, short poems collected into anthologies, and the like are enclosed in quotation marks. They denote a word that would be stressed if spoken: â€Å"Stop the car I really have to go to the bathroom.† They indicate a word being introduced as itself, not as an idea: â€Å"Write, right, and rite are all pronounced identically.† Terms of more than one word are often enclosed in quotation marks, but this format may look awkward when used inconsistently alongside single italicized words, so self-referring phrases are often italicized as well (â€Å"it’s rank and file, not rank in file†). They also identify letters used as such: â€Å"The letter n on that sign is backward.† But letters compared to shapes (â€Å"turn right at the Y in the road†; â€Å"I watched a graceful V of geese fly overhead†) are set in roman type. (The lowercase term roman refers to the default type style.) The same is true for names of letters used in expressions (â€Å"dot your i’s and cross your t’s†). They signal the use of an unfamiliar foreign term: â€Å"The Roman legatus was the equivalent of a general in a modern army.† Note, however, that many words you might think are foreign have been adopted into English, that most welcoming of languages. Check your dictionary’s main section (not the foreign-words appendix); if a foreign term appears there, no italics are necessary. Also, foreign proper nouns need no emphasis. The rule of thumb for repetition of foreign terms is to italicize on first reference only, and leave them in roman type when they recur. Use your judgment, though, depending on the frequency and interval of recurrence. 2. Boldface Boldface lettering is best reserved for display type (chapter and section titles and the like). But they’re often used in textbooks and other learning materials to emphasize newly introduced terms, such as those that would appear in a glossary or be on a vocabulary quiz. Otherwise, this type style is the printed or posted equivalent of shouting. 3. Quotation Marks Quotation marks are often used as what are called scare quotes - emphasis markers that communicate novelty, irony, or a nontraditional use of a word or phrase. Writers overuse scare quotes. Except in special cases, they should trust readers to understand the unusual use of a word or phrase. The context in â€Å"I played dumb,† for example, precludes the need for a visual hint to the reader that the writer’s stupidity was an act, but â€Å"I had a ‘fit’ so she’d go away† may need a subtle clue that the tantrum was feigned. (Fit appears in single, not double, quotation marks here because they’re used within double quotes.) Newspapers traditionally omit emphasis because formatting it is time consuming, and many web sites have the same policy, but the many exceptions in both cases or using quotation marks in place of italics, as often seen on this site acknowledge that italics and judicious use of boldface and scare quotes aid comprehension. Just don’t have a fit and go â€Å"overboard.† Want to improve your English in five minutes a day? Get a subscription and start receiving our writing tips and exercises daily! Keep learning! Browse the Punctuation category, check our popular posts, or choose a related post below:100 Words for Facial ExpressionsList of Greek Words in the English LanguageNominalized Verbs