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In more than 150 years the periodic table had many versions; hundred versions of this table are known. The sole official table is today the IUPAC Periodic Table.
There are 91 metals in the periodic table today, but new ones are added as time passes.
Many more elements are known today then when Mendeleev laid out his table. In addition, he arranged his table by atomic mass and there are places in the periodic table where mass does not always increase. An example is between tellurium and iodine.
periodic table stands for all the elments scientist have found till today. Example: gold, silver, oxegon, carbon dioxide,ect.
Dmitri Mendeleev, a Russian scientist of the 19th century, is credited with organizing the periodic table the way we know it today. We have made minor changes to his arrangement over the years (and added a bunch more elements!) but the way he put it together still works.
No there are still undiscovered elements
Dmitri Mendeleev developed the first periodic table. But the modern table was developed by Henry Moseley.
The first periodic table was developed by a Russian chemist and inventor named Dmitri Mendeleev, who arranged the elements by atomic mass. However, British chemist Henry Moseley later decided to order the elements by atomic number, thus creating a new arrangement. Moseley's table is the one used today.
Chemists
In more than 150 years the periodic table had many versions; hundred versions of this table are known. The sole official table is today the IUPAC Periodic Table.
There are 91 metals in the periodic table today, but new ones are added as time passes.
The periodic table reflects real and useful ways to categorize the elements according to some basic characteristics within groups.
well every known materialthat we asociate with is listed in the periodic table.
A group is a column in the periodic table of elements.
Henry Moseley
Dmitri Mendeleev.
Today (June 2013) the periodic table contain 118 chemical elements, natural or artificial.