a.What is the mass number of the atom?b. How many electrons are there – InterviewSolution

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1.	a.What is the mass number of the atom?b. How many electrons are there in the shell having higher energy?
Answer» The mass number (symbol A, from the German word Atomgewicht (atomicweight), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus.

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