Answers and explanation:
A is 4. This is because the atomic number is equal to the number of protons.
B is 6. This is because the mass number is equal to the number of protons plus the neutrons.
C is Be. This is because Be is atom number 4.
D is 10. This is because the atomic number is equal to the number of protons.
E is 22. This is because the mass number is equal to the number of protons plus the neutrons.
F is Ne. This is because Ne is atom number 10.
