Why are group viia elements very active nonmetals

Silica, sio2, is formed on silicon as an electrically insulating layer for microelectronic devices. silica is formed when silicon is exposed to o2 gas at an elevated temperature. at 900˚c, it takes 90 minutes for the oxygen to diffuse from the surface to form a 0.06 micron (0.06 x 10-6 m) thick layer of sio2 on

Ionic compounds are made of ions, and yet the overall charge of an ionic compound is neutral. why?

What is the mass of 2.00 l of an intravenous glucose solution with a density of 1.15 g/ml?