Question

The number of protons, neutrons and electrons in $^{175}_{71} Lu,$ respectively , are :

• A. 71, 104 and 71
• B. 104, 71 and 71
• C. 71, 71 and 104
• D. 175, 104 and 71

Answer 1

The Correct Option is A

To determine the number of protons, neutrons, and electrons in the given isotope \(^{175}_{71} Lu\), we follow these steps:

1. Identify the Atomic Number:
   • The atomic number is represented as the subscript in the isotope notation. For \(^{175}_{71} Lu\), it is 71. This number represents the number of protons.
2. Determine the Electrons:
   • In a neutral atom, the number of protons equals the number of electrons. Therefore, the number of electrons in this isotope is also 71.
3. Calculate the Neutrons:
   • The mass number is represented as the superscript. For \(^{175}_{71} Lu\), it is 175. The mass number is the sum of protons and neutrons.
   • To find the number of neutrons, subtract the number of protons from the mass number: 
     \(175 - 71 = 104\)

In conclusion, the number of protons, neutrons, and electrons in the isotope \(^{175}_{71} Lu\) are 71, 104, and 71 respectively.

Therefore, the correct option is: 71, 104, and 71.