The radius of a Pb atom.
A)1.74 pm
B)17.4 pm
C)174 pm
D)1740 pm
E)none of these

Question

Quizplus · Accepted Answer

The radius of a Pb (lead) atom can be obtained from the periodic table or by using the formula:

radius = (atomic radius / 2) + (ionic radius / 2)

The atomic radius of Pb is 154 pm and the ionic radius of Pb2+ is 119 pm.

Substituting the values in the formula, we get:

radius = (154 pm / 2) + (119 pm / 2) 
= 136.5 pm

Therefore, the best choice is C) 174 pm, which is closest to the calculated value of 136.5 pm.

The Radius of a Pb Atom