Atoms X, Y, Z, and R have the following nuclear compositions: 
Which of the following are isotopes of the same element?
Definitions:
Time-Value
The concept that money available at the present time is worth more than the same amount in the future due to its potential earning capacity.
Money
Any item that is generally acceptable to sellers in exchange for goods and services.
Present Value
A calculation of today's value of money to be received in the future or ongoing cash flows, based on a given rate of return.
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