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Chapter 5 - Connections to out Changing World
na
17
Chemistry
10th Grade
12/02/2009

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Term
Dmitri Mendeleev
Definition
1860- Russian, heard of the standardized masses and now created the first periodic table based on similar properties
Term
Dmitri's Periodic Table
Definition
when elements were placed in increasing atomic mass, similar chemical properties appeared at regular intervals (periodic); groups were created to place elements with similar properties together; predicted scandium, gallium, germanium
Term
Henry Moseley
Definition
1911- was working with Rutherford; noticed a better pattern- instead of increasing mass, he increased protons
Term
Modern Periodic Table
Definition
an arrangement of the elements in order of their atomic numbers so that elements with similar properties fall in the same column (group)
Term
Helium
Definition
doesn't have a p-sublevel so when the s-level is filled, it is stable like group 18
Term
Transition Metals
Definition
-block, groups 3-12; e- configuration: (n-1) d#ns^2; pure state: high luster and good conductors; less reactive than groups 1 and 2; some don't react at all- palladium, platinum, and gold
Term
Alkaline-Earth Metals
Definition
group 2; e- configuration: ns^2; pure state: harder, denser, and stronger than group 1; too reactive to be found freely in nature
Term
s-block elements
Definition
groups 1 (alkali metals) and 2 (alkaline-earth metals); chemically reactive metals
Term
Octet Rule
Definition

rule that states that atoms tend to gain, lose or share electrons so thaot each atom has a full outermost energy level

typically 8 levels (octo)

Term
Noble Gases
Definition
unreactive due to octet nature; discovered in 1894 by Lord Rayleigh and SIr William Ramsay- discovered Argon, followed by the others in group 18
Term
True or False:
the elements of group 1A in the periodic table are Halogens
Definition
Term
Family Name 1A
Definition
 H   Li   Na   K   Rb   Cs
Term
Family Name 2A
Definition
Be

Mg

Ca

Sr

Ba
Term
Faimly Name 7A
Definition
F

CI

Br

I

At
Term
Family Name 8A
Definition
Term
Name Periodic Trend
Definition
1) is a property that changes predictably as you move across a period or down a group of periodic table
Term
Perioduc Trend
Definition
Atomic radius increses moving down a group
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