18 Electron Rule is an organometallic chemistry card game designed to help inorganic chemistry students on their valence electron counting of a metal complex. Based on the game of 21 (blackjack), ligand and metal cards will be paired to reach the stable valence electron count, 18. Quick and easy gameplay that can re-enforce the student's organometallic counting skills. 

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Play for keeps with the addition of benzene poker chips (sold separately - pack of 60 chips).