Periodic Table
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15 terms
Terms | Definitions |
|---|---|
 Group | A column or family on the periodic table |
| Period | a row on the periodic table |
| ionization energy | energy required to remove an electron from an atom |
| atomic radii | the distance between the nucleus and the outer energy level in an atom |
| periodic law | when elements are arranged by atomic numbers, elements with similar properites appear at regular intervals |
| valence electrons | electrons in the outermost energy level in an atom |
| main-group elements | element in groups 1-2 and 13-18 (s and p blocks) |
| alkali metals | Group 1 metals; react with water to make alkaline solutions |
| alkaline earth metals | Group 2 metals; found as compounds rather than as pure elements |
| halogens | Group 17 - most reactive all nonmetal elements |
| noble gases | Group 18 - have a full set of valence electrons. Atoms are very stable. |
| transition metals | d block elements |
| lanthanides | f block elements; similar to alkaline earth metals |
| actinides | f block elements; elements are radioactive |
| electron shielding | inner electrons shield the outermost electrons from the full attractive force of the nucleus |
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