![]() The Teacher Guide accompanying this activity further supports teachers in determining the most appropriate level at which to address student learning needs through a list of suggested questions and discussion starters. Reduces the cognitive load for all students by linking trends directly to the periodic table, a tool available to students throughout the chemistry course.Supports development of a causal understanding of why trends change as they do through the creation of a graphical representation.Uses the Periodic Table as a foundational aspect of the major trends, allowing for students to make connections between placement on the Periodic Table and a specific trend.By mapping specific trends directly onto a blank Periodic Table, the activity The activity detailed here is different from other readily available inquiry-based activities as it seeks to support student learning and concept development by using an actual Periodic Table as a template. Four models are developed: atomic radius, ionic radius, ionization energy, and electronegativity. Students create their own diagrams using blank periodic tables of the main group elements in the first four periods. The tiered levels of questions and reflection may be used to differentiate between introductory, advanced first-year, and AP chemistry. This inquiry activity was designed to be carried out in ninety minutes, with few supplies, yet produces an accurate visualization of the trends. Students often memorize trends, but to get a true grasp of their meaning and what causes certain patterns is best understood when students create their own models and discuss the patterns with others. (In the modern periodic table, a group or family corresponds to one vertical column.Trends related to placement of elements on the periodic table are often taught using diagrams in a textbook. The periodic table allows chemists a shortcut by arranging typical elements according to their properties and putting the others into groups or families with similar chemical characteristics. Were it not for the simplification provided by this chart, students of chemistry would need to learn the properties of all 118 known elements. The term “periodic” is based on the discovery that elements show patterns in their chemical properties at certain regular intervals. Mendeleev left spaces for elements he expected to be discovered, and today’s periodic table contains 118 elements, starting with hydrogen and ending with oganesson, a chemical element first synthesized in 2002 at the Joint Institute for Nuclear Research (JINR) in Dubna, Russia, by a team of Russian and American scientists. Its story is over 200 years old, and throughout its history, it has been a subject for debate, dispute and alteration.Īttempts to classify elements and group them in ways that explained their behavior date back to the 1700s, but the first actual periodic table is generally credited to Dmitri Ivanovich Mendeleev, a Russian chemist who in 1869 arranged 63 known elements according to their increasing atomic weight. Go into any scientist’s office or lecture hall anywhere in the world and you are likely to see one. There is no more enduring reflection of science than the Periodic Table of Chemical Elements, which sheds light not only on the essence of chemistry but physics and biology as well.
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