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

Answer: (A)

71, 104 and 71

Answer 2

$^{175} Lu_{71}$
Number of electrons=71
= Number of protons $= 71$
Number of protons + number of neutrons = mass number
71+ number of neutrons = 175.
Number of neutrons $= 175 - 71 = 104$