within an atom, protons are red, neutrons are green, and
elements from the periodic table: hydrogen, carbon and oxygen
![氦 he helium ['hi:lj m, -li m] 3.锂 li lithium ['liθi m] 4.](http://i.handsetwalls.com/uploads/i_0_4210037080x3780832004_253.jpg)
氦 he helium ['hi:lj m, -li m] 3.锂 li lithium ['liθi m] 4.
![氦 he helium ['hi:lj m, -li m] 3.锂 li lithium ['liθi m] 4.](http://i.handsetwalls.com/uploads/i_2_3322216510x2173043516_253.jpg)
氦 he helium ['hi:lj m, -li m] 3.锂 li lithium ['liθi m] 4.
the number of neutrons (and therefore the mass of an element)
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