ScienceChemistryThe Periodic Table Chapter 5
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The Periodic Table Chapter 5

Jeffrey Edwards avatar Jeffrey Edwards
25 July 2022
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question
How did Mendeleev organize the elements in his periodic table?
answer
arranged the elements into rows in order of increasing mass so that elements with similar properties were in the same column.
question
What is a periodic table?
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an arrangement of elements in columns, based on a set of properties that repeat from row to row.
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How did Dmitri Mendeleev developed an approach for organizing the elements?
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solitaire
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What was Mendeleev's Prediction?
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used the properties of elements located near the blank spaces in his table to predict properties for undiscovered elements.
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What evidence helped verify the usefulness of Mendeleev's table?
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close match between Mendeleev's predictions and the actual properties of new elements showed how useful his periodic table could be.
question
What name did Mendeleev give the missing element one space below Aluminum?
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eka-aluminum
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What was the name of the element discovered in 1875 by a French chemist?
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gallium
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What are some uses for the element gallium?
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traffic signals and tiny light emitting diodes (LEDs)
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In Mendeleev's periodic table, elements with similar properties were grouped
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in the same column.
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How is the modern periodic table organized?
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by increasing atomic number (number of protons).
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What is each row on the Periodic Table called?
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period
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How many periods are there on the Periodic Table?
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7
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What is each column on the Periodic Table called?
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group
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What is periodic law?
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states many of the physical and chemical properties of elements usually recur in a manner with increasing atomic number
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What does the atomic mass of an element depend on?
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the distribution of an element's isotopes in nature and the masses of those isotopes.
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What is atomic mass unit?
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one twelfth the mass of a carbon-12 atom.
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What are the four pieces of information for each element?
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atomic mass, atomic number, element symbol, element name
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What categories are used to classify elements on the periodic table?
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metals, nonmetals, and metalloids
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Where are the Transition Metals on the Periodic Table?
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groups 3 through 12
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What are Transition Metals?
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elements that form a bridge between the elements on the left and right sides of the table.
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What is a nonmetal?
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any element that is not a metal on the periodic table
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What are the characteristics of a nonmetal?
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Brittle, poor conductors of heat and electricity, and low boiling points
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What is a metal?
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elements that are good conductors of electric current and heat.
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What are the characteristics of a metal?
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malleable, ductile, and high boiling points
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What is the most reactive nonmetal?
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fluorine
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What is a metalloid?
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elements with properties that fall between those of metals and nonmetals.
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How do properties vary across a period in the periodic table?
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Across a period from left to right, the elements become less metallic and more nonmetallic in their properties.
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Why do the elements in a group have similar properties?
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because they have the same number of valence electrons.
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What is a valence electron?
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an electron that is in the highest occupied energy level of an atom.
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Why is hydrogen group with the metals in Group 1A?
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it has a single valence electron, it is grouped with other elements, such as lithium, that have only one valence electron.
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What are the elements in Group 1A called?
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alkali metals
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How does the reactivity of the Alkali Metals respond as you down the group?
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increases from the top of Group 1A to the bottom.
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What are the element in Group 2A called?
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alkaline earth metals.
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How many valence electrons do group 2A have?
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2
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How are the differences in reactivity among the alkaline earth metals shown/
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reactivity is shown by the way they react with water.
question
The element magnesium plays a key role in what biological process?
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Photosynthesis
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What element is found in oyster shells and a plaster cast?
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Calcium
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What is the most abundant metal in the Earth's crust?
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aluminum
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Besides water what element is in most of the compounds in the human body?
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carbon
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What two elements are used in fertilizers?
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nitrogen and phosphorus.
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What is the most abundant element in the Earth's crust/
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oxygen
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What are the elements in Group 7A called?
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halogens
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What is unique about the elements in group 7A?
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Despite their physical differences, the halogens have similar chemical properties
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What are the elements of Group 8A called?
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Noble gases
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What are some characteristics of the Noble gases?
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colorless and odorless and extremely unreactive.
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What element with the atomic mass of 39.098 is essential to muscle and nerve function?
answer
Potassium
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What metal is a liquid at room temperature?
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Mercury
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What is the Element symbol for Molybdenum?
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Mo
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What element has the atomic number 82 and element symbol Pb?
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Lead
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What element, atomic mass 50.941, plays a key role in the formation of teeth and bones?
answer
Vanadium