- published: 23 Nov 2015
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A period 5 element is one of the chemical elements in the fifth 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 fifth period contains 18 elements, beginning with rubidium and ending with xenon. As a rule, period 5 elements fill their 5s shells first, then their 4d, and 5p shells, in that order, however there are exceptions, such as rhodium.
This period contains technetium, one of the two elements until lead that has no stable isotopes (along with promethium), as well as molybdenum and iodine, two of the heaviest elements with a known biological role, and Niobium has the largest magnetic known penetration depth of all the elements. Zirconium is one of the main components of zircon crystals, currently the oldest known minerals in the earth's crust. Many later transition metals, such as rhodium, are very commonly used in jewelry due to the fact that they are incredibly shiny.
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".