Question

select the correct answer.
which statement is true with respect to an atom?
a. the electrons remain enclosed in the nucleus of an atom.
b. the atomic mass of an atom depends solely on the number of protons in the nucleus.
c. the atomic number of an atom is equal to the number of protons.
d. the protons and neutrons in the nucleus of an atom constitute the atomic number.

Explanation:

• A is false: Electrons orbit the nucleus, not inside it.
• B is false: Atomic mass depends on protons + neutrons.
• C is true: Atomic number = proton count by definition.
• D is false: Protons alone define atomic number, not neutrons.

Answer:

C. The atomic number of an atom is equal to the number of protons.