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HELLSGUARDIAN
 2 years ago
Best ResponseYou've already chosen the best response.2Atomic no. is the no. of protons /electrons in a stable atom.. and mass no is the sum of no of protons & no of nuetrons in the nucleus.. hence they are not same..:)

JFraser
 2 years ago
Best ResponseYou've already chosen the best response.1the atomic mass we find on the periodic table is an average of all the isotopes of that particular atom. The mass number of a single atom is the number of protons & neutrons inside a SINGLE atom of that element. Mass number must always be a whole number, since it's describing a count of things. The atomic mass, since it's an average, doesn't have to be a whole number, even though it is often very close to a whole number.
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