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periodic table 2
| Question | Answer |
|---|---|
| noble gases | extremely unreactive elements in group 18 with eight valence electrons and a full outer shell that are colorless and odorless gases. |
| lanthanides | 15 rare elements in period 6 with filling f-orbitals that have similar chemical properties and are used in magnets and electronics |
| actinides | 15 elements in period 7 with filling f-orbitals that are often radioactive and include uranium and plutonium |
| group | vertical column of elements on the periodic table that share similar chemical propertices |
| period | a horizontal row of elements on the periodic table that have thesame number of electron shells |
| valence electrons | electrons in the ouitermost shell of an atom that determine how it reacts with other elements |
| reactivity | the tendency of an element to undergo chemical reactions with other substances |
| metal | an element that conducts electricity, is shiny, and can be bent or shaped without breaking |