Problem: Which statement is true?(A) The atomic number of an element is the number of protons in one atom.(B) The nucleus of an atom contains neutrons and electrons.(C) The number of electrons outside the nucleus is the same as the number of the neutrons in the nucleus.(D) The mass number of an atom is the number of protons in the nucleus plus the number of electrons outside.

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Which statement is true?

(A) The atomic number of an element is the number of protons in one atom.

(B) The nucleus of an atom contains neutrons and electrons.

(C) The number of electrons outside the nucleus is the same as the number of the neutrons in the nucleus.

(D) The mass number of an atom is the number of protons in the nucleus plus the number of electrons outside.


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