<https://www.legendapress.ru/special-investigation/how-did-scientists-find-out-how-many-electrons-and-nucleons-are-in-chemical-elements-if-no-one-has-ever-seen-atoms/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.legendapress.ru/special-investigation/how-did-scientists-find-out-how-many-electrons-and-nucleons-are-in-chemical-elements-if-no-one-has-ever-seen-atoms/>