Across a period from left to right, the covalent radius decreases. As you move from left to right across the periodic table, atoms have more electrons in their outer energy level and more protons ...

The periodic table captures a subtle pattern that runs through the chemical ... Lithium, for example, with an atomic number of 3, is a reactive metal — just like sodium (element number 11 ...

Researchers at these three laboratories will ... element 118 falls within group 18 of the periodic table, it is a noble gas, with a particular naming pattern. each of the elements in group 18 ...

His principal contribution to chemistry was the 'vis tellurique' (telluric screw), a three-dimensional ... for his search for a pattern in inorganic chemistry. Just four years before Mendeleev ...

The periodic ... rows of the table, but chemical characterisation is still needed for the heaviest elements to confirm that their properties match their positions. It is not yet known how far the ...

It allows us to spot patterns and make predictions about other elements.. While you're watching, look out for where different elements are found in the periodic table. Mrs Roberts: So, here I have ...