The water found on Earth is almost entirely made up of the 1H1H and 16O16O isotopes for a formula of H2OH2O and a molecular mass of 18.0 amuamu. What is the largest mass that a water molecule could have using other isotopes

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

it's filtration, but this is an assumption so my apologies if i got this

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons