The atomic number of one particular isotope is equal to its mass number. Which isotope is it?

Short Answer

Expert verified
Answer: Hydrogen-1 (protium)

Step by step solution

01

Understanding atomic number and mass number

The atomic number (Z) of an element represents the number of protons in its nucleus. The mass number (A) of an isotope is the total number of protons and neutrons (N) in its nucleus. Mathematically, we can express it as A = Z + N.
02

Finding an isotope with equal atomic number and mass number

In this exercise, we are looking for an isotope where the atomic number (Z) is equal to its mass number (A). This means A = Z, or Z + N = Z, which implies that the number of neutrons (N) must be 0. The only element with 0 neutrons is hydrogen-1, also known as protium. Protium has 1 proton and 0 neutrons.
03

Conclusion

The isotope with the atomic number equal to its mass number is hydrogen-1 (protium).

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