Examine the table.
Element Number of Protons
copper (Cu)
lodine (1)
francium (Fr)
lead (Pb)
a
Ob
Oc
Od
29
francium
lead
iodine
copper
53
87
82
Number of
Neutrons
Which element has the greatest atomic mass?
35
74
136
125
Number of Electrons
29
53
87
82