An unknown element is a mixture of isotopes ¹⁵¹X and ¹⁵³X. The average atomic mass of X is 151.69 amu. What is the percent abundance of ¹⁵³X? Please provide an explanation with the answer :)
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The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false

Pastoral farming is best described as a. a method of raising livestock and moving herds b. an african method of agriculture c. a method of cultivating crops on poor soils d. a common method of desert farming select the best answer from the choices provided a b c d

Which statement characterizes synthetic polymers? a. they come from animals and plants. b. they are found in nature. c. they are made in a lab. d. they are components of starch.