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    				| 1. | Sum of protons and neutrons is called as________ | 
| Answer» mark me as brilliant plz if you liked the answerExplanation: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. | |