Ca-Sr-Ba, P-As-Sb, Cl-Br-I, Cu-Ag-Au ... be superimposed upon the table): Fig. 1. The 'periodic chain of elements The elements are arranged according to increasing atomic number or atomic weight.

These are almost one-quarter of the periodic table and are mainly found in the first four periods. Of these, 11 are essential elements that our bodies need in larger amounts: oxygen, carbon ...

Scientists have discovered the elusive properties hidden within promethium, a rare earth element that has remained largely ...

Central to physics are ideas such as energy, mass, particles and waves. Physics attempts to both answer philosophical questions about the nature of the universe and provide solutions to ...

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