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ChemVocabPeriodicity

QuestionAnswer
actinide series a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium (2nd row of f-block elements)
atomic radius The distance from the center of an atoms nucleus to the farthest electron(s) of that atom.
alkali metal Any element from the first column of the periodic table (group 1); any of a group of soft, white, low-density, low-melting, highly reactive metallic elements, including lithium, sodium, potassium, rubidium, cesium, and francium.
alkaline earth metal Any element from the second column of the periodic table (group 2); beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba) and radium (Ra)
electronegativity a measurement of how much an atom tends to steal electrons from atoms that it's bonded to. Elements at the top right of the periodic table (excluding the noble gases) are very electronegative while atoms in the bottom left are not very electronegative
family the same thing as a "group"
group a column (the things up and down) in the periodic table. Elements in the same group tend to have the same properties. These are also called "families".
halogen any element in the second to last column (group 17) of the periodic table.
ionization energy the amount of energy required to pull an electron off of a gaseous atom.
lanthanide series any element in the 4f block of the periodic table from (57) La to (70) Yb
melting point the temperature at which the vapor pressure of the solid and the liquid are equal. At the melting point the solid and liquid phase exist in equilibrium.
metallic character chemical properties associated with elements classed as metals; arise from the element's ability to lose electrons
noble gas any element in the right hand column (Group 18) on the periodic table; Any of a group of six elements (helium, neon, argon, krypton, xenon, and radon), originally named ‘inert’ because of the stability of their electronic structure
oxidation number the charge that an atom would have if all bonding electrons (bonded to more electronegative atoms) were removed
period a row (left to right) in the periodic table.
periodic law the principle that the properties of the elements change with increasing atomic number in a periodic (regularly reoccurring) way -that's why you can stick the elements into a chart and have the elements line up in nice families.
precipitate A solid that is formed in, and separates itself from a solution
thermal conductivity A measure of the ability of a material to transfer heat; measured in watts per meter per kelvin. Symbol = λ or k (sometimes shortened to "conductivity").
transition metal the metallic elements within Groups 3 to 12 of the Periodic Table that have an incomplete inner electron shell and serve as transitional links between the most and the least electropositive in a series of elements.
trend a regular variation in the properties of an element with increasing atomic number (see http://chemistry.about.com/od/periodictableelements/a/periodictrends.htm)
valence electrons the electrons of an atom that can participate in the formation of chemical bonds with other atoms; the electrons in the outer-most shell of an atom that are involved in bonding
Created by: skurdoo
 

 



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