Question

The number of protons, neutrons and electrons in ${ }_{71}^{175} L u$, respectively, are :
A 71,104 and 71
B 104,71 and 71
C. 71,71 and 104
D 175,104 and 71

Answer 1

Solution:
${ }^{175} \mathrm{Lu}_{71}$ Number of electrons
$=$ Number of protons $=71$
Number of neutrons $=175-71=104$

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