The mass number of an element is equal to
A. the total number of electrons.
B. the sum of the protons and neutrons.
C. less than twice the atomic number.
D. a constant number for the lighter elements.

The mass number of an element is equal to
A. the total number of electrons.
B. the sum of the protons and neutrons.
C. less than twice the atomic number.
D. a constant number for the lighter elements.

The mass number of an element is equal to A. the total number of electrons. B. the sum of the protons and neutrons. C. less than twice the atomic number. D. a constant number for the lighter elements.

Original conversation

User: The mass number of an element is equal to
A. the total number of electrons.
B. the sum of the protons and neutrons.
C. less than twice the atomic number.
D. a constant number for the lighter elements.

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