Historical clue formulations

• They get minuses in chemistry — 2019-11-16
• Hydroxides, e.g. — 2017-01-06
• What chemists find attractive? — 2015-05-24
• Parts of galvanic cells — 2012-07-14
• Negatively charged particles — 2009-12-09
• Particles in electrolysis — 2008-05-11
• Particles in electrolysis — 2007-08-05
• Charged particles — 2003-10-22
• Negative particles — 2002-09-08
• Particles in electrolysis — 1997-05-24