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mass number
the total number of protons and neutrons in an atomic nucleus.
 
micro
a prefix meaning one-millionth of a unit.
 
milligrams per liter (mg/l)
this is a weight per volume designation used in water and wastewater analysis. 1mg/L = 1ppm.
 
molar
a solution concentration having one mole of solute per liter of solution.
 
molarity
a measure of solution concentration expressed in moles of solute per liter of solution.
 
molecular weight
the sum of the atomic weights of all the atoms in a molecule.
 

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