What made his version successful was the fact that he left gaps ... John Newlands took issue with the credit that Mendeleev was given for the periodic table in his book ‘On the Discovery of the ...

Humans are made of many chemical elements that work ... These are almost one-quarter of the periodic table and are mainly found in the first four periods. Of these, 11 are essential elements ...

While you're watching, look out for where different elements are found in the periodic table. Mrs Roberts: So, here I have an empty pop can. This is made of aluminium. Aluminium is an element.