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Periodic Table
Elements
17
Science
Not Applicable
12/08/2005

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Term
Periodic law
Definition
states that the repeating chemical and physical properties of elements change periodically with the ATOMIC NUMBER of the elements.
Term
Periodic
Definition
Describes something that occurs or repeats at regular intervals
Term
Period
Definition
in chemstry, a horizontal row of elements.
(from left to right)
Term
Group
Definition
a vertical column of elements;( from top to bottom) elements in a group SHARE chemical properties.
Term
Physical and chemical properties of elements change across each
Definition
period
Term
Elements in a group usually have similar
Definition
properties
Term
Elements in the periodic table are classified as;
Definition
metals, nonmetals, and metalloids
Term
Each vertical column on the periodic table is a
Definition
Group
Term
Elements to the right of the zig-zag line are called
Definition
Nonmetals
Term
Mendeleev arranged elements by their
Definition
increasing atomic mass
Term
The elements' properties follow a pattern that repeats every
Definition
7 elements
Term
A property of Alkali Metals
Definition
Very Reactive
Term
Iodine and Chlorine are example of
Definition
Halogens
Term
Chlorine and bromine are examples of
Definition
Halogens
Term
Have two outer-level electrons.
Definition
alkaline-earth metals
Term
Compounds of carbon, are necessary for life on Earth. They contain proteins, fats and
Definition
carbohydrates
Term
In the Boron Group, the most common element is
Definition
aluminum
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