Scandium and Germanium were the other two elements discovered by 1886, and helped to cement the reputation of Mendeleev’s periodic table. The final triumph of Mendeleev’s work was slightly unexpected.

Like all noble gases, xenon is colourless ... In 1869, Mendeleev's first periodic table did not include them, as closed-shell elements remained undiscovered until Lord Rayleigh and William ...

The answer, at first, is boring: it’s a simple no. But the reasons why you cannot are complex and varied – some come from the ...

These superheavy elements (SHE) complete the seventh row of the periodic table, culminating in element ... reminiscent of noble gases. This challenges traditional periodic trends and underscores ...

such as metals or gases, while also giving each individual element its own chemical symbol. In this periodic table of ...

The earliest attempt to classify the elements was in 1789, when Antoine Lavoisier grouped the elements based on their properties into gases ... the diagram of the periodic table above separates ...