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b) no.atom =40, no.massa 75
no neutron = no massa - no atom
36 = no massa - 46
36 + 46 = no masssa
82 = no massa
b. no atom = no proton = 40
no neutron = no massa - no atom
35 = no massa - 40
35 + 40 = no massa
75 = no massa
semoga membantu :) maaf kalo salah