Answer
See explanation
Work Step by Step
Recall the periodic table structure
Periods = horizontal rows in the periodic table
Blocks are based on the subshell of the outermost electron:
s-block: Groups 1–2
p-block: Groups 13–18
d-block: Groups 3–12
f-block: Lanthanides and actinides (periods 6–7)
Identify the fifth period elements
Period 5 elements (from left to right) are:
Rubidium (Rb) – Group 1
Strontium (Sr) – Group 2
Yttrium (Y) – Group 3
Zirconium (Zr) – Group 4
Niobium (Nb) – Group 5
Molybdenum (Mo) – Group 6
Technetium (Tc) – Group 7
Ruthenium (Ru) – Group 8
Rhodium (Rh) – Group 9
Palladium (Pd) – Group 10
Silver (Ag) – Group 11
Cadmium (Cd) – Group 12
Indium (In) – Group 13
Tin (Sn) – Group 14
Antimony (Sb) – Group 15
Tellurium (Te) – Group 16
Iodine (I) – Group 17
Xenon (Xe) – Group 18
Summary
s-block: Rb, Sr
d-block: Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd
p-block: In, Sn, Sb, Te, I, Xe
f-block: none in period 5
