<h2>Hello!</h2>
The answer is: The mass number of an atom is obtained by totaling the number of protons and neutrons.
<h2>
Why?</h2>
The atomic mass can be calculated by the sum of the protons and neutron mass of an element.
We should not confuse the atomic mass with the relative atomic mass since the relative atomic mass of an element is the average mass of its particles/atoms compared to 1/12th the mass of a carbon-12 particle/atom.
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Washington Irving. ... He is best known for his short stories "Rip Van Winkle" (1819) and "The Legend of Sleepy Hollow" (1820), both of which appear in his collection, The Sketch Book of Geoffrey Crayon, Gent.
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The Mexican Revolution was a huge rebellion that occurred from 1910-1920.
Answer: Hi Venti here. Your answer is B!
Explanation:Hope it helps