The atomic mass of an element is

Question

A. the sum of the protons and electrons in one atom of the element.
B. twice the number of protons in one atom of the element.
C. a ratio based on the mass of a carbon-12 atom.
D. a weighted average of the masses of an element’s isotopes. ****

Answer 1

You're correct

Answer 2

thank you so much Starkiller !!

Answer 3

wait which one is it then??

Answer 4

so the correct answer is C????

Answer 5

You guys/gals really need help. The initial answer given is the correct answer. That is D.