Question

the number of protons in an atom can be determined by _____ adding the number of neutrons to the number of electrons subtracting the atomic number from the atomic mass the elements atomic number adding the atomic mass to the atomic number

Explanation:

The atomic number of an element is defined as the number of protons in the nucleus of an atom of that element. Adding neutrons to electrons has no relation to finding proton - number. Subtracting atomic number from atomic mass gives the number of neutrons. Adding atomic mass to atomic number is an incorrect operation for finding proton - number.

Answer:

C. the element's atomic number