Question

Atomic weight is the _____.

combined masses of an element's isotopes
weighted average of an element's isotopes
average number of neutrons in an element's isotopes

Answer 1

Answer:

your answer is here

Explanation:

the atomic mass is a mass of an atom although the SI unit of mass is kilogram , the atomic mass is often expressed in the non SI unit Dalton where 1 dalton is defined as 1/12 of the mass of a single carbon 12 atom at rest

Answer 2

For any given isotope, the sum of the numbers of protons and neutrons in the nucleus is called the mass number. This is because each proton and each neutron weigh one atomic mass unit (amu). By adding together the number of protons and neutrons and multiplying by 1 amu, you can calculate the mass of the atom.