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Periodic Table
Term | Definition |
---|---|
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 |