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Chapter 3
Introduction to the Periodic Table
38
Chemistry
10th Grade
10/19/2009

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Term
Comet
Definition
Patterns Predictable
Term
1860
Definition
Scientists: 60 elements discovered with determined atomic mass. Classified them in groups
Term

Coinage Metals

 

Definition
Copper, Silver, Gold
Term

Alkali Metals

 

Definition
Lithium, sodium, potassium
Term

Halogens

 

Definition

Chlorine, bromine, and iodine

Saltlike

Term
J.W. Dobereiner
Definition
1829, German Chemist. Classified elements into Triads.
Term
Triad
Definition

3 elements, similar chem properties

ex. Chlorine, Bromine, Iodine

Term
Middle Element in Triad
Definition
average atomic mass of other 2 elements. Also density
Term
Properties of element
Definition
Related to atomic mass
Term
Dmitri Medeleev
Definition
Russian Chemist, Developed Periodic Table. Realized elements reapeted in an orderly way by chem and phys props
Term
Periodic Table
Definition
Lightest to heaviest, horrizontal rows
Term
Periodicity
Definition

Tendency to recur at regular intervals

Ex. Periodic Table

Term
Periodic Law
Definition
Statement, physical and chemical props of element repeat in regular pattern, ordered in increasing atomic number
Term
noble gases
Definition

elements with full complement of valence electrons, unreactive. Noble gas element ends every row.

 

Term
Metal
Definition

elements that have er, conduct heat, electricity, and bend without breaking. All metals have 1, 2, or 3 valence electrons (not tin, lead, and bismuth) Metal element begins every new row

 

located mostly (Group 3-12) = transition element = metal

 

Term

Transition elements

 

Definition
elements in Groups 3-12, all metals
Term
Lanthanides
Definition

first series of inner transition elements, follow atomic number 57 and end 71

(rare earth elements)

Term
actinides
Definition

second series of inner transition, Atomic numbers range from 90 to 103

Radioactive

None beyond Uranium(92) occur in nature

Term
Nonmetals
Definition

don't conduct electricity, much poorer conductors of heat than metal, and brittle when solid

Most gasses

5,6,7, or 8 valence electrons (not carbon)

Term
Mettaloids
Definition

chem, physical props of metals and other props of nonmetals

Border between metal, nonmetal

most semiconductors

 

 

Term
Semiconductor
Definition

element does not conduct electricity as well as a metal, but better than a nonmetal.

better conduct electric charge = adding bits other elements

Term
Similar Property Elements
Definition
Put togethor in a horizontal row, also similar elements similar in vertical rows
Term
eka
Definition
Simble for undiscovered element
Term
Atomic Number
Definition

= number of electrons in the element. Sets order for periodic table. +1 every new element left to right.

The arrangment of Elements does not matter about the atomic mass.

Term
Period
Definition

Horizontal Row,

If all electrons cant fit in energy level, element starts a new period with remaining electrons and becomes first element in a group

Term
Group
Definition

(Family) consists of elements in a vertical column

Ex. Lithium, first group, period 2

Term
Period Structure
Definition
Each starting period noble gas, add 1 valence electron each new period up to 18 = 8 valence electron. 
Term
Group Structure
Definition

Main = 1=1,2=2,13=3,14=4,15=5,16=6,17=7,18=8

Elements in same group = similar props because the same valence electron #

Term
Synthetic Elements
Definition
man made elements, made from nuclear reaction
Term

Classifying elements

 

Definition

Classified by chem and phys props

Blue= metals = majority= left side 

yellow= non-metal= right corner 

green= metalloid= boundary between m, n

 

Term
Atomic Structure MMN
Definition

prop differences = different ways electrons arranged.

behavior = #, arrangement, tightness of valence electrons

Term
Electrons and Electricity
Definition

Elec current = flow of electrons

Current = val electrons not held tightly, free move

 

Term
Semiconductor elec conduction
Definition
Doping
Term
Doping
Definition
addition of small amount other element to semiconductorto increase electrical conductivity
Term
n-type element
Definition
Doped element with extra electron (negatively charged)
Term
p-type
Definition
Doped element with extra electrons (positive charged)
Term
Diodes
Definition

n-type + p-type = diode

Electrical flow: negative terminal to positive terminal

Term
Combine Electrons
Definition
depend entirely on valence electons
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