55 Cesium -Cs- The cesium in this ampoule melts if you hold it in your hand for a minute, yielding the prettiest liquid gold. If the ampoule were to break in your hand, the resulting explosion would be extremely unpleasant.
Natural Blue Obsidian (raw) Obsidian is a very special stone. It is not a true mineral. It is actually a volcanic glass that forms when molten lava cools too rapidly to crystallize. It consists mostly of Silicon Dioxide.
Alkene Reactions Organic Chemistry Cheat Sheet Study Guide - See all the alkene reactions at a glance including reactants, reagents, products, regioselectivity and stereoselectivity showing Markovnikov and anti-Markovnikov, syn/anti additions and
Organic chemistry Oxidation and Reduction reactions study guide cheat sheet covering the various redox reactions in organic chemistry 1 and 2 including starting material, chemical reagents, and products
Based on known margins of safety between normal and toxic dietary exposures, selenium is more poisonous than either arsenic or mercury. However, selenium, in minor amounts, is an essential trace nutrient for animals and humans.