Chemistry · Concept of atom, molecule, element and compound
4 protons, 5 neutrons, and 4 electrons are there in an atom of beryllium. Its ma
4 protons, 5 neutrons, and 4 electrons are there in an atom of beryllium. Its mass number is:
- A. 10
- B. 5
- C. 8
- D. 9
Step-by-step solution
Mass number = number of protons + number of neutrons = 4 + 5 = 9.
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