What is the smallest particle in the list below? A piece of dust
A skin cell
A cell of E. coli
An atom

Tin has ten stable isotopes. the heaviest, 124sn, makes up 5.80% of naturally occuring tin atoms. how many atoms of 124sn are present in 82.0 g of naturally occurring tin? what is the total mass of the 124sn atoms in this sample?

What three things determine the shape and size of a puddle when water is poured out onto a surface

What is the empirical formula for c4h8o2