2.3: The Periodic Table

THE PERIODIC TABLE

Arranged in order of increasing atomic number.


Rows = Periods --> Produced by the electron configuration of each element.
Columns = Groups --> All elements in a group behave chemically similar.

SECTION A & B

(A) Representative Elements: predictable properties
(B) Transition Metals: unpredictable chemical properties.


GROUPS


1A: Alkali Metals
2A: Alkali Earth Metals
7A: Halogens
8A: Noble Gases