Chemistry Regents Exam August 2022
All atoms of an element have the same (1) mass number (2) atomic mass
(3) number of neutrons
(4) number of protons
Explanation: All atoms of an element MUST have the same number of protons (which is equal to the atomic number). Atomic number to an element is like a social security number to a person. Each element has a unique atomic number that is specific to it.
Answer: 4