The atom of an element is made up of 4 protons, 5 neutrons and 4 electrons. What is its atomic number and mass number?
The atom of an element is made up of 4 protons, 5 neutrons and 4 electrons. What is its atomic number and mass number?
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Protons = 4, neutrons = 5, electrons = 4
Atomic number = 4,
Mass number = 4 + 5 = 9
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