Classification of Elements- The Periodic Table — Chapter Summary

As more elements were discovered

As more elements were discovered, it became difficult to remember all their properties. A systematic arrangement helped group elements with similar ch

An element was defined as any

An element was defined as any substance that cannot be decomposed into a further simple substance by a physical or chemical change.

Elements with similar properties were grouped

Elements with similar properties were grouped in threes. The atomic weight of the middle element was the arithmetic mean of the first and third. For e

When elements were arranged in increasing

When elements were arranged in increasing atomic weight, every eighth element resembled the first. Newlands was the first to assign numbers to element

The physical and chemical properties

The physical and chemical properties of elements are periodic functions of their atomic weights.