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英文字典中文字典相关资料:

Period (periodic table) - Wikipedia
A period on the periodic table is a row of chemical elements All elements in a row have the same number of electron shells Each next element in a period has one more proton and is less metallic than its predecessor Arranged this way, elements in the same group (column) have similar chemical and physical properties, reflecting the periodic law
Periodic table - Wikipedia
The periodic table, also known as the periodic table of the elements, is an ordered arrangement of the chemical elements into rows (" periods ") and columns (" groups ") An icon of chemistry, the periodic table is widely used in physics and other sciences It is a depiction of the periodic law, which states that when the elements are arranged in order of their atomic numbers an approximate
Period - Wikipedia
Period (gene), gene in Drosophila involved in regulating circadian rhythm Period (periodic table), horizontal row of the periodic table "Period-" or "per-iod-", chemical prefix where "per" refers to oxidation state and "iod" refers to iodine Unit of time or timeframe Period (geology), subdivision of geologic time Period (physics), the duration of time of one cycle in a repeating event Orbital
Types of periodic tables - Wikipedia
A rendering of Bayley's periodic table of 1882 [25] A redrawn version of Kapustinsky's triangular or step pyramid periodic table (1953) [26] Period 0 includes the electron and neutron Each period repeats once Two kinds of bilateral symmetry are present: shape; and metals and nonmetals in each half Triangular tables have column widths of 2-8-18-32 or thereabouts An early example, appearing
Periodic trends - Wikipedia
The periodic trends in properties of elements In chemistry, periodic trends are specific patterns present in the periodic table that illustrate different aspects of certain elements when grouped by period and or group They were discovered by the Russian chemist Dimitri Mendeleev in 1863 Major periodic trends include atomic radius, ionization energy, electron affinity, electronegativity
Period 1 element - Wikipedia
A period 1 element is one of the chemical elements in the first row (or period) of the periodic table of the chemical elements The periodic table is laid out in rows to illustrate periodic (recurring) 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 analog elements fall into the same
Periodicity - Wikipedia
Periodicity Look up periodicity or periodic in Wiktionary, the free dictionary Periodicity or periodic may refer to:

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