Since then, the periodic table has evolved to reflect over 150 years of scientific development and understanding in chemistry and physics. Today, with 118 known elements, it is widely regarded as one ...

Thanks to Moseley’s work it now became possible to place elements in the periodic table according to their atomic number rather than their atomic weight. Today the periodic table is the starting point ...

Electronegativity, an essential characteristic of all elements in the periodic table, measures an atom's ability to attract electrons towards itself within a chemical bond. This vital theoretical ...