Periodic Table Trends Test Questions – Flashcards
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Who is the first to organize elements according to atomic mass? |
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Dmitri Mendeleev |
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Who organized the elements according to atomic number? |
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Henry Mosely |
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How is the periodic table arranged? |
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by properties |
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Groups |
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Families, columns |
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Periods |
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rows |
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Group 1 |
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The Alkali Metals |
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soft, highly reactive, quickly react with oxygen in air, when added to cold water-reacts vigorously, form ion with a +1 charge |
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characteristics of group 1 |
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Group 2 |
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The Alkali Earth Metals |
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harder, denser, stronger, and have higher melting points than the alkali metals. less reactive than the alkali metals. form ion with a +2 charge |
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characteristics of group 2 |
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the alkaline earth metals have ____ electrons in the highest energy level |
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2 |
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Groups 3-12 |
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The Transitional Metals |
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Metallic elements that have varying properties, not as reactive as the elements in previous groups, fill the d orbitals, have higher melting points than previous groups with 1 exception |
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Groups 3-12..Transition Metals |
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What is the exception of _________, the transition metals have higher melting points than groups 1 and 2 |
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Mercury |
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Group 13 |
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Boron Group |
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Has 3 valance electrons |
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The Boron Group, 13 |
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Ends in a px1 orbital |
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group 13,Boron group |
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Group 14 |
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Carbon group |
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has 4 valance electrons |
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carbon, group 14 |
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ends in py1 orbital |
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carbon, 14 |
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group 15 |
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Nitrogen Group |
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has 5 valance electrons |
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Nitrogen group, 15 |
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ends with pz1 orbital |
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group 15, Nitrogen |
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Group 16 |
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Oxygen Group |
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six valance electrons |
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oxygen, 16 |
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group 17 |
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Halogen |
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7 valance electrons |
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group 17, halogen |
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ends in a px2 electrons |
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group 16, oxygen |
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ends in a py2 |
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group 17, halogens |
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combine easily with metals, especially the alkali metal, to form compounds known as salts. the most reactive nonmetal elements |
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group 17, halogens |
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group 18 |
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Noble Gas |
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have full s and p orbitals in the highest energy level, have low reactivity because this electron configuration is very stable meaning it is resistant to change, 8 valence electrons, very stable elements |
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group 18, noble gases |
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What are the 2 groups of the rare earth elements? |
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Lanthadides and Actinide |
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Lanthanides |
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atomic numbers from 58 to 71, end in a 4f orbital, all shiny reactive metals |
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Actinide |
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atomic numbers from 90 to 103, end in a 5f orbital, unstable and radioactive, only the first 4 have been found naturally on earth. the remaining actinides are known only as laboratory made elements |
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Hydrogen |
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because of its unique properties, hydrogen is in a group by itself |
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four regions of the periodic table |
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metals, nonmetals, metalloids, noble gases |
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metals (6) |
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good conductors of heat and electricity, solids under ordinary condition (except mercury), ductile, malleable, luster, left side of table |
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ductile |
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can be drawn into fine wire |
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malleable |
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can be hammered or rolled into thin sheets |
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luster |
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shiny |
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Nonmetal |
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opposite of metals...right side of table |
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Metalloids (3) |
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have some characteristics of metal and others characteristic of nonmetal, semi conductor, found along stair step line |
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Periodic Law |
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properties of elements tend to change with increasing atomic number in a periodic way |
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Atomic Radius |
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one half of the distance from center to center of 2 like atoms |
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atomic radius trend |
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increases down column, decreases across the row |
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Ionization energy |
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amount of energy needed to remove an electron from a specific atom or ion in its ground state in the gas phase |
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ionization energy trend |
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decreases down column, increases across row |
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electron negativity |
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tendency for an atom to attract electrons to itself when it is combined with another atom |
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electronegativity trend |
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decreases down column, increases across row |
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electronegativity trend |
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decreases down column, increases across row |
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electronegativity trend |
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decreases down column, increases across row |
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electronegativity trend |
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decreases down column, increases across row |
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electronegativity trend |
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decreases down column, increases across row |
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electronegativity trend |
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decreases down column, increases across row |
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electronegativity trend |
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decreases down column, increases across row |
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electronegativity trend |
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decreases down column, increases across row |
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electron affinity |
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amound of energy change that occurs when an electron is acquired by a neutral atom |
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affinity trend |
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decreases down, increases across |