His principal contribution to chemistry was the 'vis tellurique' (telluric screw), a three-dimensional arrangement of the elements constituting an early form of the periodic classification ... that ...

The periodic table’s arrangement also allows scientists to discern trends in element properties, including electronegativity, ionization energy, and atomic radius. Many scientists worked on the ...

The periodic table - AQA Mendeleev made an early periodic table. In the modern periodic table, elements are in order of atomic number in periods and groups. Electronic structures model how ...

When the first periodic table was formulated by Mendeleev, it was the only group that contained just a single known element — manganese. In the early twentieth century, several claims were made ...

Certainly, from the empiricist point of view much might be made of the existence in Nature of manifold periodic recurrences, and the recognition of large- and small–scale rhythms has certainly ...

To celebrate the International Year of the Periodic Table (IYPT) in 2019, we asked clubs to submit new designs for the poster. Below is the 2019 version of the poster. Check below the periodic table ...

You interact with about two-thirds of the elements of the periodic table every day. Some, like carbon, oxygen, and nitrogen, make up our bodies and the air we breathe. Yet there is also a class of ...