The periodic table of chemical ... trends in element properties, including electronegativity, ionization energy, and atomic radius. Many scientists worked on the problem of organizing the elements, ...
A chemical element ... But what is an element really? It is a more subtle question that you might realise. To get to grips with it, it helps to first understand that atoms, the basic units of ...
It's important to use the names and chemical symbols for the first 20 elements in the periodic table, as well as the elements in groups 1 and 7.
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