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Periodicity Vocab

Periodicity Vocabulary Practice for Bromfield Honors Chemistry

QuestionAnswer
Alkali metals The elements in group 1
Anion A negatively charged ion
Cation A positively charged ion
Group Elements located in the same vertical column in the periodic table; assigned numbers from 1 to 18
Lanthanides The set of elements from lanthanum through ytterbium
Actinides The set of elements from actinium through nobelium
Metal Elements that are hard, shiny, and good conductors
Metalloid Elements with both metallic and nonmetallic properties
Nonmetal When forming compounds, frequently gains electrons and can share its outer electrons with other atoms
Octet Rule An atom with eight electrons in its outermost level is unreactive.
Period The horizontal rows in the periodic table
Periodic Law The properties of elements are a periodic function of their atomic numbers
Transition Element The elements in groups 3 through 12
Triad Term coined by Dobereiner to describe groups of three related elements
Alkali earth metals The elements in group 2
Halogens The elements in group 17
Noble gases The elements in group 18
Atomic radius The size of an atom
Valence electrons The electrons in the outermost s and p orbitals
Electron affinity The attraction of an isolated atom for an additional electron
First ionization energy The energy required to remove the most loosely held electron in an atom
Ionic radius The size of an ion
Ionization energy The energy required to remove an electron from an atom
Shielding effect Outer electrons do not feel the total nuclear charge because it is partially “screened” by the inner electrons
Electronegativity The tendency of an atom in a compound to attract electrons to itself
Main block elements Elements in groups 1, 2, 13-18 (s and p blocks)
Created by: kvanderveen
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