द्रव्यमान संख्या
(aangrezi:Mass Number) rasayan vijnan mean kisi paramanu ke nabhik mean upasthit prot aaunoan aur nyootronoan ki sankhyaoan ka yog us paramanu ki dravyaman sankhya kahalati hai. ise Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://api.formulasearchengine.com/v1/":): {\mathbf {A}} se pradarshit karate haian.
dravyaman sankhya= prot aaunoan ki sankhya + nyootr aaunoan ki sankhya
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sanbandhit lekh
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