Question

What is the difference between the average atomic mass and the mass number?

Answer 1

Explanation:

The average atomic mass is the  mean weight of all the isotopes of an element. It is usually calculated by summing up all the mass numbers of the isotopes of the element and dividing this sum by the  number of isotopes.

The mass number is the sum of neutrons and protons in the nucleus of an atom. It differs between isotopes of an element and between atoms of different elements.

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Answer 2

Answer:

Atomic mass is the mass of a specific isotope of an element. Average atomic mass is the weighted average mass of all isotopes of an element.

Explanation: