Create your page here
- Playlist
- Import Videos
- Chat
Enter words or phrases, names or places to create your custom video playlist.
You can also enter Youtube or Wn URLs
You can also enter Youtube or Wn URLs
- Playlist
- Import Videos
- Chat
Enter words or phrases, names or places to create your custom video playlist.
You can also enter Youtube or Wn URLs
You can also enter Youtube or Wn URLs
A period 4 element is one of the chemical elements in the fourth row (or period) of the periodic table of the elements. The periodic table is laid out in rows to illustrate recurring (periodic) trends in the chemical behaviour of the elements as their atomic number increases: a new row is begun when chemical behaviour begins to repeat, meaning that elements with similar behaviour fall into the same vertical columns. The fourth period contains 18 elements, beginning with potassium and ending with krypton. As a rule, period 4 elements fill their 4s shells first, then their 3d and 4p shells, in that order, however there are exceptions, such as chromium.
Every single one of these elements are stable, and many are extremely common in the earth's crust and/or core. Many of the transition metals in period 4 are incredibly strong, and therefore commonly used in industry, especially iron. Copper is one of three elements that are not silver or gray in color, along with caesium and gold. Two adjacent elements are known to be toxic, with arsenic one of the most well-known poisons, and selenium being toxic to humans in large quantities. Many elements are essential to humans' survival, such as Calcium being what forms bones.
This page contains text from Wikipedia, the Free Encyclopedia -
http://en.wikipedia.org/wiki/Period_4_element
This article is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License, which means that you can copy and modify it as long as the entire work (including additions) remains under this license.
This article is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License, which means that you can copy and modify it as long as the entire work (including additions) remains under this license.
Listen to Daniel Radcliffe interviews
Daniel Jacob Radcliffe (born 23 July 1989) is an English film and stage actor who rose to prominence playing the title character in the Harry Potter film series.
Radcliffe made his acting debut at age ten in BBC One's 1999 television movie David Copperfield, followed by his film debut in 2001's The Tailor of Panama. At age eleven he was cast as the title character in the first Harry Potter film, and he starred in the series for ten years until the release of the eighth and final film in July 2011. He also began to branch out to stage acting in 2007, starring in the London and New York productions of the play Equus and in the 2011 Broadway revival of the musical How to Succeed in Business Without Really Trying. In addition, he starred in 2007's December Boys and the 2012 hit horror film The Woman in Black. He will play beat poet Allen Ginsberg in 2013 indie film Kill Your Darlings.
Radcliffe has contributed to many charities, including Demelza House Children's Hospice and The Trevor Project. He has also made public service announcements for the latter. In 2011, he was awarded the Trevor Project's "Hero Award".
This page contains text from Wikipedia, the Free Encyclopedia -
http://en.wikipedia.org/wiki/Daniel_Radcliffe
This article is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License, which means that you can copy and modify it as long as the entire work (including additions) remains under this license.
This article is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License, which means that you can copy and modify it as long as the entire work (including additions) remains under this license.