Question

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

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

Answer 1

Answer: (A)

${}^{175}L{u}_{71}$ Number of electrons
= Number of protons $=71$
Number of neutrons $=175-71=104$