Which of the following is responsible for most of the mass of an atom?
A) neutron.
B) proton.
C) electron.
D) both neutrons and protons
E) both electrons and neutrons
Correct Answer:
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Q15: The mass number of an element is:
A)
Q16: Atom Y has 11 protons, 11 electrons,
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Q19: The atomic number of an atom is
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