[" ILLUSTRATION "4.18],[" The mass numbe...

[" ILLUSTRATION "4.18],[" The mass number of three isotopes of an element are "11,12,],[" and "13" units.Their percentage abundances "80,15," and "5,],[" respectively.What is the atomic weight of the element? "],[[" a."11.25," b."20," c."16," d."10]]

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[" ILLUSTRATION "4.18],[" The mass number of three isotopes of an element are "11,12,],[" and "13" units.Their percentage abundances "80,15," and "5,],[" respectively.What is the atomic weight of the element? "],[[" a."11.25," b."20," c."16," d."10]]

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