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 ...

Two years later, Julius Lothar Meyer and William Odling independently published their own versions of a periodic table. Meyer’s table was comprised of 44 elements arranged by valency; Odling’s version ...

So how has the periodic table been put together ... Each square in the table contains an element symbol of one or two letters, not the element name. This makes it less cluttered and easier ...

But how many of these elements do you know? Test your knowledge and compete with other Live Science readers to see who can ...

A chemical element is one of those squares on the periodic table that adorns many a classroom wall. Sure. But what is an element really? It is a more subtle question that you might realise.

More than 75 years after its initial discovery, scientists have created an organometallic molecule containing the ...

But one thing people have notoriously debated is what the limit of the periodic table is. Unfortunately, there’s no clear consensus on how many elements could be discovered, as every scientist ...

Electronegativity, an essential characteristic of all elements in the periodic table, measures an atom's ability to attract electrons towards ... Yet Pauling's scale is the first and the most common ...

One of the most remarkable things about ... asked to examine the radioactivity of actinium, which is element number 89 in the periodic table. She was the first to observe the α and β radiation ...