Atoms X, Y, Z, and R have the following nuclear compositions: 
Which two are isotopes?
Definitions:
Strip Bond
A fixed-income security that is created by separating the principal and interest payments of a longer-term bond, selling them as individual zero-coupon bonds.
Yield Rate
Yield rate represents the earnings generated and realized on an investment over a particular period, expressed as a percentage.
Compounded Semi-annually
Pertains to the process of adding interest to the principal sum of a loan or deposit on a twice-yearly basis, allowing the interest to also earn interest at these intervals.
Service Industries
Sectors of the economy that provide services rather than physical goods, such as healthcare, banking, and education.
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