Thallium (Tl) - 81 on the Periodic Table | Periodic Table

Standard IUPAC: Thallium • Symbol: Tl • Atomic Mass: 204.38 u

Quick Factsheet: Thallium (symbol Tl, atomic number 81) is element 81 on the periodic table of elements. It has a standard atomic weight of 204.38 u and an electron configuration of [Xe] 6s2 4f14 5d10 6p1. On the periodic table, Thallium is classified in period 6 and group Main.

1. Periodic Table Position of Thallium (81 on the Periodic Table)

Element Thallium has atomic number Z = 81, meaning it contains 81 protons in its atomic nucleus and 81 electrons in its neutral state. On the standard periodic table of elements, Thallium is located in period 6 and group Main.

2. Electron Configuration & Oxidation States (Thallium Charges & Configuration)

Full Electron Configuration: [Xe] 6s2 4f14 5d10 6p1

Common Oxidation States (Charges): 1c,3c

3. Physical Properties & Atomic Mass (Thallium Atomic Mass)

Element Thallium has a standard atomic weight of 204.38 u. Its melting point is 577. K and boiling point is 1746. K. The Pauling electronegativity value is 1.62.

Comprehensive chemical properties and data for Thallium (Tl, Z=81).

Explore interactive 3D electron orbitals, isotopes, and properties on the periodic table: Open on Interactive Table 🚀

4. Related Elements in the Same Chemical Family

Al (Z=13) Ga (Z=31) In (Z=49) Sn (Z=50) Pb (Z=82) Bi (Z=83)

5. Frequently Asked Questions about Thallium (FAQ)

What is the chemical symbol and atomic number of Thallium?

The chemical symbol of Thallium is Tl and its atomic number is 81.

What is the atomic mass and electron configuration of Thallium?

Thallium has a standard atomic mass of 204.38 u and ground-state electron configuration of [Xe] 6s2 4f14 5d10 6p1.

What periodic table group and period does Thallium belong to?

Thallium is located in period 6 and group Main on the periodic table of elements.

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