What does the following chemical symbol whose atomic number is 81 represent?
Tl

Answer
Tl: Thallium
Atomic Number: 81
Tl: Thallium
Atomic Number: 81

Answer
Tl: Thallium
Atomic Number: 81
Tl: Thallium
Atomic Number: 81
Tin
Thallium
Thorium
Thulium