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6 Cards in this Set

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Demitri Mendeleev
credited with the periodic table

hoped to organize elements according to their properties
Periodic Table
ordered elements according to their atomic mass

Mendeleev published in 1869
Why was the periodic table 1st created with empty spaces?

Mendeleev predicted...
these were left for elements that had not yet been discovered

the existance and properties of these elements
Henry Mosely
organized elements in increasing atomic number

discovered the Modern Periodic Table
periodic law
states that chemical and physical properties of elements and their periodic function occurs by atomic number
Noble Gases
later added to the periodic table

these to so long to be discovered because of their total lack of CHEMICAL REACTIVITY