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- Dictionaryperiodic/ˌpɪərɪˈɒdɪk/
adjective
- 1. appearing or occurring at intervals: "the periodic visits she made to her father"
- 2. relating to the periodic table of the elements.
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1 day ago · Learn about Iridium, a chemical element with the symbol Ir and atomic number 77, on Wikipedia's comprehensive page.
1 day ago · Definition and applicable elements Unless otherwise noted, this article describes the stable form of an element at standard temperature and pressure (STP). [b] While arsenic (here sealed in a container to prevent tarnishing) has a shiny appearance and is a reasonable conductor of heat and electricity, it is soft and brittle and its chemistry is predominately nonmetallic. Nonmetallic chemical ...
3 hours ago · UNESCO is a specialized agency of the United Nations that promotes international cooperation in education, culture, science and peace. Learn more about its history, goals and activities on Wikipedia.
16 hours ago · The number of valence electrons follows a periodic pattern across the periodic table. Elements in the same group have the same number of valence electrons, which gives them similar chemical ...
1 day ago · Human history is the development of humankind from prehistory to the present, understood through history, archaeology, anthropology, linguistics, genetics and various other academic disciplines.
1 day ago · History Early history The first settlement in the Enugu area was the small Nike village of Ogui, which was present since the era of the Atlantic Slave Trade. Nike in the Igbo language means "with strength or power." The Nike people acquired most of their lands through slave raiding, as the area was mostly unsettled. The Nike people used slaves as part of their defence strategy. They placed ...
3 hours ago · The Islamic Golden Age was a period of scientific, economic and cultural flourishing in the history of Islam, traditionally dated from the 8th century to the 13th century.
