Express 0.00212 in scientific notation.

Select all that apply. a beta particle: is electromagnetic energy is an electron has zero charge is emitted from the nucleus has a +2 charge has a -1 charge

In the lab, ammonia was mixed with water to form ammonium hydroxide. what is/are the reactant(s)? o water and ammonia o ammonia o ammonium hydroxide need

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?