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Question
The atom of an element is made up of 4 protons, 5 neutrons and 4 electrons. What are its atomic number and mass number?
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Solution
Atomic number = Number of protons or number of electrons = 4
Mass number = Number of protons + Number of neutrons = 4 + 5 = 9
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Give short answer:
what is the atomic mass number? mention its formula.
What is the relation between mass number & atomic number?
