Problem: Below is a representation of 50 atoms of a fictitious element called westmontium (Wt). The red spheres represent Wt-296, the blue spheres Wt-297, and the green spheres Wt-298. Calculate the percent natural abundance of Wt-297 isotope.

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We're asked to calculate the percent natural abundance of Wt-297 isotope.


We’re given a diagram showing 50 atoms of a fictitious element called westmontium (Wt):

  • red spheres: Wt-296
  • blue spheres: Wt-297
  • green spheres: Wt-298 


Recall that percent abundance is the percent value of the number of naturally occurring isotopes for a given element.  We will use the equation: 


Percent Abundance=number of isotopetotal number of isotopes×100


To do so, we need to count the # of Wt-297 isotopes from the given diagram:


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Problem Details

Below is a representation of 50 atoms of a fictitious element called westmontium (Wt). The red spheres represent Wt-296, the blue spheres Wt-297, and the green spheres Wt-298. 

The figure shows 50 spheres. There are 12 green spheres, 2 blue spheres, and 36 red spheres.

Calculate the percent natural abundance of Wt-297 isotope.

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What scientific concept do you need to know in order to solve this problem?

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