As we have seen, Mendeleev was not the first to attempt to find order within the elements, but it is his attempt that was so successful that it now forms the basis of the modern periodic table.

They obtained a beautiful scale that works both for small and large differences in electronegativity. The new scale uses electronegativity as a dimensionless quantity, which is very practical and ...

The covalent radius (a measure of how large individual atoms are ... As you move from left to right across the periodic table, atoms have more electrons in their outer energy level and more ...