What is the half-life of radon-222 if a sample initially contains 120.0 mg and only 18.1 mg after 12.3 days?

What overall charge must all compounds have

Between 2014 and 2016, more than 25,000 children in flint, michigan, drank water that was contaminated with lead from lead pipes. during this time, the city claimed the water was safe to drink. which of these actions could the city have taken to ensure that the drinking water was free from lead?

How can nonpolar molecule contain polar covalent bonds