How do the types and numbers of atoms that repeat to make up a substance affect its properties? PLZZ answer it’s due tmr

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?

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit

Maya wrote if you step to describe how carbon circulates between the atmosphere and living organisms