Transcript Mastering the Periodic Table


All known elements are identified and
arranged in one chart called the periodic
table.
History
60 different elements were discovered
by 1860, by a Russian teacher named
Dmitri Mendeleev.
 He observed that the elements with
similar properties often ended up in the
same column.

Arrangement
The composition of substances
determines the properties of those
substances.
 In modern periodic table elements are
ordered based on atomic number.
 This means that the elements are
ordered according to the number of
protons always found in an atom of that
element.

Elements are substances that cannot be
broken down into other substances and
are made up of only one kind of atom.
 Today scientists have discovered 117
different elements.

Organizing the Elements
The periodic table increases in atomic
number across rows and down columns.
 The horizontal rows of the periodic table
are called periods.
 The vertical columns on the periodic
table are called groups of families.
 Vertical groups or families have similar
physical and chemical properties.

Activity 10

Arrangement of Groups and Periods:
Seeing Patterns
Reading the Periodic Table
Each block includes the chemical
symbol, element name, atomic number
and atomic mass for each element.
 The Chemical symbol- one or two letters
are used top abbreviate the name for
each element.

Activity 16

Unusual Element Symbols