<small>[[Chemistry]] | [[18th Century]]</small> | | | |---|---| |Atomic Mass|[35.45 u](https://pubchem.ncbi.nlm.nih.gov/element/17#section=Atomic-Weight)| |Standard State|[gas](https://pubchem.ncbi.nlm.nih.gov/element/17#section=Physical-Description)| |Electron Configuration|[[Ne]3s23p5](https://pubchem.ncbi.nlm.nih.gov/element/17#section=Electron-Configuration)| |Oxidation States|[+7, +5, +1, -1](https://pubchem.ncbi.nlm.nih.gov/element/17#section=Oxidation-States)| |Electronegativity (Pauling Scale)|[3.16](https://pubchem.ncbi.nlm.nih.gov/element/17#section=Electronegativity)| |Atomic Radius (van der Waals)|[175 pm](https://pubchem.ncbi.nlm.nih.gov/element/17#section=Atomic-Radius)| |Ionization Energy|[12.968 eV](https://pubchem.ncbi.nlm.nih.gov/element/17#section=Ionization-Energy)| |Electron Affinity|[3.617 eV](https://pubchem.ncbi.nlm.nih.gov/element/17#section=Electron-Affinity)| |Melting Point|[171.65 K](https://pubchem.ncbi.nlm.nih.gov/element/17#section=Melting-Point)| |Boiling Point|[239.11 K](https://pubchem.ncbi.nlm.nih.gov/element/17#section=Boiling-Point)| |Density|[0.003214 g/cm³](https://pubchem.ncbi.nlm.nih.gov/element/17#section=Density)| |Year Discovered|[1774](https://pubchem.ncbi.nlm.nih.gov/element/17#section=History)|