Why do we say grammar Nazi?

Why do we say grammar Nazi? Certainly Grammar Nazi is a popular and catchy phrase for referring to people who decry errors of grammar – or what they think...

Is PF3Cl2 nonpolar?

Is PF3Cl2 nonpolar? Decision: The molecular geometry of PF3Cl2 is trigonal bipyramidal with asymmetric charge distribution on the central atom. Therefore ...