[Answered] A new element (Tigerium) has three isotopes with mass numbers 305, 309, and 310.35 % of the naturally occurring element

A new element (Tigerium) has three isotopes with mass numbers 305, 309, and 310.35 % of the naturally occurring element is mass number 305, 20% is 309, and the rest is310. What would the average atomic mass be of this element? How many naturally occurring atoms actually have that mass?

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