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Periodic Table

TermDefinition
Dobereiner's Triads Groups of three elements with similar chemical properties where the atomic mass of the middle element is approximately equal to the average of the other two
Newland's Octaves Arrangements of elements in which the first and eighth element counting from a particular element have similar properties
Mendeleev's Periodic Law When elements are arranged in order of increasing atomic mass the properties of elements occur periodically
Mendeleev's Periodic Table Elements of similar properties in columns Left Gaps Predicted Properties Reversed Order of Some Elements
Henry Moseley Discovered using X-rays method of determining number of protons Not necessary to reverse order
Modern Table Increasing atomic number Over 100 elements No gaps Transition elements are seperate
Created by: JackEatonK98