A radioactive nuclide that is used for radiation therapy for cancer has 33 neutrons and a mass number of 60. Which is the correct symbol for this nuclide?

A. [tex]${ }_{27}^{60} Co$[/tex]
B. [tex]${ }_{30}^{50} CO$[/tex]
C. [tex]${ }_{80}^{33} CO$[/tex]
D. [tex]${ }_{27} CO$[/tex]



Answer :

Certainly! Let's go through the problem step-by-step to identify the correct nuclide symbol.

1. Understanding the Mass Number and Neutrons:
- The mass number (A) of the nuclide is given as 60.
- The number of neutrons (n) in this nuclide is given as 33.

2. Relating Mass Number to Protons and Neutrons:
- The mass number (A) is the sum of the number of protons (p) and the number of neutrons (n):
[tex]\[ A = p + n \][/tex]
- We are given:
[tex]\[ 60 = p + 33 \][/tex]

3. Solving for the Number of Protons:
- To find the number of protons, rearrange the equation:
[tex]\[ p = 60 - 33 \][/tex]
- Calculate:
[tex]\[ p = 27 \][/tex]

4. Identifying the Element:
- The Atomic Number (Z), which is the number of protons, is 27.
- The element with the atomic number 27 is Cobalt (Co).

5. Writing the Nuclide Symbol:
- Based on the mass number (A = 60) and the atomic number (Z = 27), the nuclide symbol is written as:
[tex]\[ {}_{27}^{60} Co \][/tex]

6. Comparing with Given Options:
- Let's match the options with our result:
[tex]\[ {}_{60}^{27} Co \quad (\text{match: } {}_{27}^{60} Co): \text{ matches when written correctly, hence correct} \][/tex]
[tex]\[ {}_{50}^{30} CO \quad (\text{wrong mass number}) \][/tex]
[tex]\[ {}_{33}^{80} CO \quad (\text{wrong configuration}) \][/tex]
[tex]\[ {}_{27} CO \quad (\text{wrong mass number}) \][/tex]

Among the given options, the correct symbol for the nuclide is:
[tex]\[ {}_{60}^{27} Co \][/tex]

Therefore, the correct answer is:
[tex]\[ \boxed{{}_{60}^{27} Co} \][/tex]