Zinc Has Five Naturally Occurring Isotopes with an Average Mass

question 73

Multiple Choice

Zinc has five naturally occurring isotopes with an average mass of 65.39 amu. Three isotopes, in roughly equal amounts, account for 95% of zinc. Which isotope is most abundant?

• A)(⁶⁴Zn, 63.9291 amu)
• B)(⁶⁶Zn, 65.9260 amu)
• C)(⁶⁷Zn, 66.9271 amu)
• D)(⁶⁸Zn, 67.9249 amu)
• E)(⁷⁰Zn, 69.9253 amu)

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Definitions:

Polygenic

A term describing traits or conditions caused by multiple genes, often resulting in a wide range of potential outcomes or phenotypes.

Nonadditive

Relating to or characterized by a process or effect that does not simply combine individual components in a straightforward, additive manner.

Human Genome Project

An international scientific research project aimed at mapping and understanding all the genes of the human species, completed in 2003.

Genetic Codes

Sequences of nucleotides in DNA or RNA that determine the genetic instructions used in the development and functioning of all known living organisms.