What is the atomic number of Thallium?

The atomic number of Thallium (Tl) is 81.

What is the atomic mass of Thallium?

The atomic mass of Thallium is 204.38 atomic mass units (u).

What group and period is Thallium in?

Thallium is in period 6, group 13 of the periodic table. It is a post-transition element in the p-block.

How many valence electrons does Thallium have?

Thallium has 3 valence electron(s).

Thallium (Tl) — Atomic Number 81 | Soren Periodic Table

Thallium (Tl) — Atomic Number 81Highly toxic, used in infrared optics.Thallium Properties

Atomic Number: 81

Symbol: Tl

Atomic Mass: 204.38 u

Category: post-transition

Group: 13

Period: 6

Block: p-block

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

Valence Electrons: 3

Electronegativity: 1.62

Ionization Energy: 589.4 kJ/mol

Electron Affinity: 19.0 kJ/mol

Atomic Radius: 156.0 pm

Melting Point: 577.0 K

Boiling Point: 1746.0 K

Thallium in the Periodic TableThallium is a post-transition element located in period 6, group 13 of the periodic table. It has the chemical symbol Tl and atomic number 81. The electron configuration of Thallium is [Xe] 4f14 5d10 6s2 6p1, giving it 3 valence electron(s).Interactive Thallium LearningExplore Thallium in interactive 3D with the Soren Periodic Table. View Bohr model, quantum orbital model, nucleus inspector, and phase lab with temperature and pressure controls. Includes fun facts, real-world uses, and NCTB curriculum integration for Bangladeshi students.