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
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