A chemical radical is an atom, molecule, or ion with an unpaired valence electron. The two crossword solutions for the term 'chemical radical' are AGER and OXYL. AGER stands for an 'aggregate of radicals, ' which is a group of atoms, molecules, or ions that have an unpaired valence electron. OXYL stands for an 'oxygen-containing radical, ' which is an atom, molecule, or ion with an unpaired valence electron that contains oxygen.