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Periodic Table

PT history and placement

QuestionAnswer
What did Mendeleev recognize? When the elements were arranged in order of increasing atomic mass certain similarities in their chemical properties appeared at regular intervals
Who made the first periodic table? Mendeleev
What led Mendeleev to leave blank spaces on his periodic table? he predicted the existence and properties of the elements that he believed would fill the spaces.
What was wrong with Mendeleev's table? Most of the elements could be arranged in order of increasing atomic mass but a few could not.
What did Moseley discover about atomic structure? that the atomic number is the basis for the organization on the periodic table
How did Moseley arrange his periodic table? by increasing number of protons in the neclues
What is periodic law? The physical and chemical properties of the elements are periodic functions of their atomic numbers
Is the periodic law based upon Mendeleev's or Moseley's PT? Moseley
Is the modern PT from Moseley or Mendeleev? Moseley
Representative elements include group numbers 1-8
Transition elements include the middle section
Inner Transition elements include the bottom two rows
What are the three main catagories of elements? metals,nonmetals, and metalloids
The ability of a substance to be hammered into sheets malleable
The ability of a substance to be drawn out into wire ductile
material which permits the flow of energy conductor
Break or shatter easily brittle
Why do elements in the same group have similar chemical properties? they have the same number of electrons
Where are the s block elements located? groups 1-2 (the left side)
Where are the p block elements located? groups 13-18 (the right side)
Where are the d block elements located? groups 3-12 (the middle section)
Where are the f block elements located? bottom 2
What arrangement of electrons is particularly stable? having a full outer energy lever (also called an octet)
How many naturally occurring elements? 92, 93+ are man-made
Metals are ... left of zigzag on PT shiny solid at room tempurature conduct heat/electricity malleable ductile react with some acids to form hydrogen gas
All metals are solid except mercury
Nonmetals are ... right of zigzag generally gasses or brittle at room temp poor conductors
Nonmetals are generally gasses or brittle at room temp except bromine
Metalloids are ... along the zigzag properties of both metals and nonmetals
Group I of the PT is also known as the alkali metals/ sodium family
Group I of the PT properties are extremely chemically reactive one valance electron e- conf. always ends in s^1 developed charge +1 in chem. rx.
Group II of the PT is also known as alkaline earth metals/ calcium family
Properties of Group II on the PT are chemically reactive two valance electrons e- conf. always ends in +2 develop a charge of +2 in chem. rx.
Group III on the PT also known as boron family
Properties of Group III on the PT are moderately chemically reactive three valance electrons e- conf. always ends in s^2 p^1 develop a charge of +3 in chem. rx.
Group IV on the PT is also known as carbon family
Properties of Group IV are somewhat chemically reactive 4 valence electrons e- conf. ends in s^2 p^2 develop charge of + or - 4 in a chemical reaction
Created by: Parkster
 

 



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