Consider an element Z that has two naturally occurring isotopes with the following percent abundances: the isotope with a mass number of 17 is 45% abundant; the isotope with a mass number of 20 is 55 % abundant. What is the average atomic mass for element Z?​

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Hello thereone of the following properties was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version. which property fits this description? answer: atomic mass  was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.