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Mar 7, 2018 · In chemistry, the term period refers to a horizontal row of the periodic table. Elements in the same period all have the same highest unexcited electron energy level or same ground state energy level. In other words, each atom has the same number of electron shells.
- Anne Marie Helmenstine, Ph.D.
Jul 3, 2017 · Look up definitions of chemistry words in this comprehensive A to Z chemistry dictionary. The glossary is organized alphabetically.
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Elements within the same group share the same number of valence electrons. The number of valence electrons depends on the octet rule. For example, elements in group 1 have 1 valence electron, elements in groups 3-12 have a variable number of valence electrons, and elements in group 17 have 7 valence electrons. The lanthanides and actinides, located...
Sometimes chemists classify element groups according to shared properties, which do not strictly adhere to individual columns. These groups go by the names alkali metals, alkaline earth metals, transition metals, basic metals, nonmetals, halogens, noble gases, lanthanides, and actinides. Under this system, hydrogen is a nonmetal. The nonmetals, hal...
Elements within a period share the same number of electron shells and the same highest unexcited electron energy level. Elements within a period display periodic table trends, moving from left to right, involving atomic and ionic radius, electronegativity, There are seven element periods. Some periods contain more elements than others because the n...
Fluck, E. (1988). “New Notations in the Periodic Table” . Pure Appl. Chem. IUPAC. 60 (3): 431–436. doi:10.1351/pac198860030431Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements(2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.Scerri, E. R. (2007). The periodic table, its story and its significance. Oxford University Press. ISBN 978-0-19-530573-9.period - A period is a row (left to right) of the periodic table. precision - Precision is how repeatable a measurement is. More precise measurements are reported with more significant figures .
The vertical columns on the periodic table are called groups or families because of their similar chemical behavior. All the members of a family of elements have the same number of valence electrons and similar chemical properties. The horizontal rows on the periodic table are called periods.
Aug 9, 2019 · Elements in a period share the highest unexcited electron energy level. There are more elements in some periods than others because the number of elements is determined by the number of electrons allowed in each energy sub-level. There are seven periods for naturally occurring elements: Period 1: H, He (does not follow the octet rule)
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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.
