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periodic table
development of the periodic table
24
Chemistry
11th Grade
10/24/2011

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Term
group
Definition
Term
periodic law
Definition
state that when the element are arranged by increasing atomic number there is a periodic repetition of thier properties
Term
periodic table
Definition
states that when the elements are arranged by increasing atomic number there is a periodic repitition of thier properties
Term
group
Definition
a vertical column of elements in the periodic table arranged in order of increasing  atomic number also called a family
Term
period
Definition
a horizontal row of elements in the modern periodic table
Term
representative element
Definition
elements from group 1 2,and13-18 in the modern periodic table possessing a wide range of chemical and physical properties
Term
transition elemnt
Definition
elements in groups 3-12 of the modern periodic table ans are futher divided into transition metal and inner transition metals
Term
metal
Definition
an elemnt that solid at room temperture a good conductor of heat and eletricity and generally is shinyb most metals are ductile and malleable
Term
alkali metal
Definition
group 1 elements except for hydrogen they are reactive and usually exits as compounds with other elements
Term
alkaline earth metal
Definition
name given group 2 elemnts
Term
transition metal
Definition
highest occupied s sublevel and a nearby d sublevel contain electrons
Term
inner transtition metal
Definition
the highest occupied s sublevel and a nearby f sublevel contains electrons
Term
lanthanide series
Definition
in the periodic table the f block elements from period 6 that follow the elemnts landthanium
Term
actinide series
Definition
Term
nonmetal
Definition
poor conductors of heat and electric
Term
halogen
Definition
name given to nonmetals of group 17
Term
noble gas
Definition
element in which the highest occupied s and p sublevels are filled
Term
metalloid
Definition
properties similar to those of metals and nonemetals depending upon conditions
Term
ion
Definition
properties similar to those of metals and nonmetals dependng upon conditions
Term
ionization energy
Definition
the energy required to remove an electrons fropm gaseous atom
Term
octet rule
Definition
state that atoms lose gain or share electrons in order to acuire the stable  electron configof a noble gas uration
Term
electronegativitys
Definition
an element indicate the relative ability of this its atoms to attract electrons in a chemicalbond
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