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Mendeleev's Periodic Law stated that a Periodic Table must follow certain rules.
-Elements are listed by atomic weight.
-Elements are grouped based off reoccurring patterns.
-Gaps are left for unknown atoms.
-Atomic NUMBER was arbitrary and based off a position, determined by other factors.
-Dmitri Mendeleev was born in 1834 in Toblosk, Russia.
-He attended Heidelberg University and Saint Petersbergs State University.
-In 1849 Dmitri traveled across the state of Russia in search of higher education. Dmitri did very well in school.
-In his later life, Dmitri returned to Heidelberg University to study, this is where he formulated the periodic law and the first table following that law.
Thanks to
the brilliance
of many great
scientists like
Mendeleev
and Moseley
we have the
periodic table.
British Physicist and colleague of Ernest Rutherford, Henry Moseley was born in 1887.
-He attended Eton College, Trinity College,
Oxford, and University of Manchester.
-He worked closely with many great
physicists.
-He made his greatest discovery in 1913.
-He died two years later as a royal
engineer in the british army.
In 1913 Henry Moseley was studying the periodic table when he realized that sometimes the Atomic mass of an element was ignored when the element needed to be in a certain category. Mosley was puzzled by this, so he decided to investigate further.
-He discovered that each element radiates x-rays at a unique rate.
-He plotted this on a graph and found a straight
line. ------------------------------>
-Applying these numbers, he found that the
ATOMIC NUMBER = NUMBER OF PROTONS.