netaji ka chasma kahani me captain chasme wale ke madhyam se desh ke croro nagriko ke yogdann ko rekhankit karti hai sidhh kijiye
class10
CBSE
chapter 10
netaji ka chasma
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The mass number (symbol A, from the German word Atomgewicht [atomic weight]), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. ... The mass number is different for each different isotope of a chemical element.
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