QQuestionChemistry
QuestionChemistry
Beryllium (Be) has an atomic number of 4. How many protons, neutrons, and electrons would a beryllium atom have? (Beryllium has an atomic mass of 9 amu.)
A. 4 protons, 4 neutrons, 4 electrons
B. 4 protons, 5 neutrons, 4 electrons
C. 4 protons, 4 neutrons, 5 electrons
D. 5 protons, 4 neutrons, 4 electrons
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Answer
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Step 1:Let's solve this step by step:
Step 2:: Determine the number of protons
- Therefore, a beryllium atom has $$4$$ protons
- The atomic number of an element tells us the number of protons in its nucleus - For beryllium, the atomic number is 4
Step 3:: Calculate the number of neutrons
- $$9 - 4 = 5$$ neutrons
- Atomic mass is the total number of protons and neutrons - Number of neutrons = Atomic mass - Number of protons
Step 4:: Determine the number of electrons
- Since beryllium has $$4$$ protons, it will have $$4$$ electrons
- In a neutral atom, the number of electrons equals the number of protons
Step 5:: Verify the details
- Electrons: $$4
- Neutrons: 5
Final Answer
B. 4 protons, 5 neutrons, 4 electrons
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