is used in many home smoke alarms. If 10% of the americium in a smoke detector decays in 180 years, what is the half-life of this isotope

Well to my expert knowledge and my exquisite calculations i think the the negative ion # 412 is the key to sucess

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   

Wow that a lot of text for my tiny so i no wanna answer

Higher temperature = molecules move around faster. and vice versa.