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October 8,2016 8-308
A periodic table shows all known elements in the universe and organizes the elements by chemical properties. The first periodic table was created by a Russian chemist Dimitri Mendeleev in 1896 .In 1869 he had accomplish his goal on organizing 63 elements by
During the nineteenth century, chemists began to categorize the elements according to similarities in their physical and chemical properties. The end result of these studies was our modern periodic table.
Russian chemist Dmitri Mendeleev in 1869. 1860
Looked for common properties in elements
Then arranged by atomic mass
Noticed similar properties appeared at regular intervals “periodic”
1869 – He drew up the first periodic table of the known elements of his time by arranging the elements in order of increasing atomic weight.
He noticed repeating patterns which lead him to make very accurate predictions about undiscovered elements. In the late 1860s (after Newlands), Mendeleev
began working on trying to organize the elements
by their properties.
In 1869 he achieved his goal
by arranging all of the 63
Known elements by their
properties and their atomic
Elements were organize into GROUPS having similar Chemical properties.
In 1869 Medeleev arranged all of the 63 known elements
by their properties and their atomic weights.
Where a gap existed in the table,
Mendeleev predicted a new element
would one day be found!
He was right! Three predicted missing
elements were found during his Lifetime:
Henry Moseley (1911)
Elements fit into patterns better if arranged by atomic number
e.g. Te and I
orderd elements by atomic nimber instead of atomic mass
first to determine the atomic numbers of the elements
In particular Empedocles 490 – 435 BCE, had the idea that there were four basic building blocks (elements) from which everything was made: