The mass numbers of the different isotopes of that element are averaged according to their respective abundances in nature.
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Answer:
Explanation:
To calculate for the percent error, determine the difference between the values given and divide by the true value,
(-655 - -603)/(-603) = 0.0862
Multiply by 100%,
(0.0862) x 100% = 8.62%
The answer is B. Day hope this helps. If helpful please give branliest answer so I can level up.
Answer:
The mass number (A) of an atom is the total number of protons and neutrons in its nucleus. ... Because electrons have virtually no mass, just about all the mass of an atom is in its protons and neutrons. Therefore, the total number of protons and neutrons in an atom determines its mass in atomic mass units (Table 4.5. 1).