Knowing just the atomic mass of an element allows inferences about which of the following?

Knowing just the atomic mass of an element allows inferences about which of the following? 





A) the chemical properties of the element
B) the number of protons in the element
C) the number of neutrons in the element
D) the number of protons plus neutrons in the element
E) both the number of protons and the chemical properties of the element






Answer: D


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