A period 7 element is one of the chemical elements in the seventh row (or period) of the periodic table of the chemical 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 seventh period contains 32 elements, tied for the most with period 6, beginning with francium and ending with ununoctium, the heaviest element currently discovered. As a rule, period 7 elements fill their 7s shells first, then their 5f, 6d, and 7p shells, in that order, however there are exceptions, such as protactinium.

All elements of period 7 are radioactive. This period contains the actinides, which contains the heaviest naturally occurring element, californium; subsequent elements must be synthesized artificially. Whilst one of these (einsteinium) is now available in macroscopic quantities, most are extremely rare, having only been prepared in microgram amounts or less. The later, transactinide elements have only been identified in laboratories in batches of a few atoms at a time: of these, ununtrium, ununpentium and those beyond livermorium have not been recognised by the IUPAC.

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".