Question

multiple choice question
which is the weighted average mass of all naturally occurring isotopes of an element, measured in atomic mass units (amu), according to the national education

• average atomic mass
• atomic number
• mass number

Explanation:

The average atomic mass is the weighted - average mass of all naturally occurring isotopes of an element, measured in atomic mass units (amu). The atomic number is the number of protons in an atom's nucleus, and the mass number is the sum of protons and neutrons in an atom's nucleus.

Answer:

A. average atomic mass