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The standard on which the atomic mass unit is based is the mass of a A. proton. B. neutron. C. chlorine-35 atom. D. carbon-12 atom.

Roger Moore

in Chemistry

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Ralph Lopez on December 7, 2018

Response;D. carbon-12 atomExplanation;-A unit of atomic mass is the mass which is exactly equal to one-twelfth of the mass of one carbon-12 atom. Therefore, the mass of carbon-12 is 12 amu, and this provides the standard that is used in the measurement of the atomic mass of all other elements. -The atomic mass of carbon is 12.01 and not 12.00 in the periodic table. -Due to the fact that there is more than one element for the majority of the natural elements, the average mass of the naturally occurring mixture of isotopes is taken while the determination of the atomic mass of an element.


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