If the half-life of Xe-133 is 5.2h, how much of a 20.-mCi sample is still active after 15.6 h?

The answer is a) carbon-12

Olá. porque a reação na temperatura é muito rapida a do copo : )

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf