A Brieft History: The
Periodic Table

Hennig Brand
• 1649
–
Discovered
the
element
Phosphorus.
The
pictures
below
is
“red
phosphorus.”

A.E. Beguyer de
Chancourtois
• 1817
–
Listed
elements
by
increasing
atomic
mass
on
a
cylinder.

Johann Dobereiner
• 1862
–
Proposed
the
Law
of
Triads,
where
three
elements
in
nature
with
the
mass
of
the
middle
element
being
the
average
of
the
other
two.

John Newlands
• 1863
–
Classified
the
56
known
elements
into
a
table
with
11
groups
based
on
properLes
.
Law
of
Octaves:
any
element
will
behave
similarly
to
the
8th
element.

Lothar Meyer
• 1864
–
Developed
a
shortened
version
of
the
table
only
showing
half
of
the
known
elements,
in
order
of
atomic
mass
and
differences
in
behavior
were
due
to
mass.

Dmitri Ivanovich
Mendeleev
• 1869
–
Rearranged
elements
in
order
of
their
properLes.
He
showed
a
verLcal,
horizontal,
and
diagonal
relaLonship
between
the
63
known
elements.

Lord Rayleigh
• 1895
–
Discovered
argon
and
found
it
didn’t
fit
in
the
current
groups.
In
1898
he
proposed
a
new
group
to
be
called
zero
group

Ernest Rutherford
• 1911
–
Studied
nuclei
which
led
to
the
concept
of
nuclear
charge.

Henry Mosely
• 1913
–
Published
results
of
x-­‐ray
wavelengths
of
elements
which
proved
the
elements
are
in
order
of
atomic
number.

Glenn Seaborg
• 1940
–
Discovered
plutonium
and
all
elements
from
94-­‐102.
He
moved
the
Lanthanides
and
AcLnides
below
the
table.

Current Periodic Table
2012

Different Types of
Periodic Tables

Hydrogen is removed:

Pictures showing where
they’re found:

3D Model:

Visual: Pictures of actual
elements

Circular Model:

3D Desk Periodic Table

Interactive Periodic Tables
• hZp://www.ptable.com/
• hZp://www.chemicalelements.com/
• hZp://www.webelements.com/
• hZp://www.periodicvideos.com/

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