Download The Periodic Table

The Periodic Table
Understanding the Periodic Table of Elements
Mendeleev: Discovered a set of patterns that helped him organize
Repeating Order Metals, Metalloids, Non-Metals
*Except for Hydrogen*
Elements are made of only One kind of Atom
 Symbols have either one or two letters
 The first letter of each symbol is a capital letter
 The second letter is a lowercase letter
What is the Periodic Table?
• a table of the chemical elements in which the elements are arranged
by order of increasing Atomic Number, which is also the # of protons
• Horizontal Rows – Periods (7)
• Vertical Columns – Groups (18) can also be called “Families”
• An element’s properties can be predicted from its location in the
periodic table
Groups
Elements in the same Group
have similar properties
Periods
Elements in the same Periods
have the same # of orbitals
Reading the Periodic Table
Atomic Number = # of protons = # of electrons
Atomic Mass =
Atomic #
Mass #
26
54
25
56
# of protons + # of neutrons
# of Protons
# of Neutrons