---
title: "Tellurium (Te): Atomic Mass, Electron Configuration & Properties"
url: https://www.moldraw.com/elements/tellurium.html
description: "Tellurium (Te), element 52: atomic mass 127.6, electron configuration [Kr] 4d¹⁰ 5s² 5p⁴, group 16, period 5, p-block metalloid. Melting and boiling point, density, electronegativity and shells."
lang: en
publisher: Scidart Academy
generated: 2026-11-03
---
52Te127.6

# Tellurium (Te) – element 52

Tellurium is a chemical element with the symbol **Te** and atomic number **52**. It is a metalloid in group 16 (chalcogens), period 5 of the periodic table (p-block), and is a solid at room temperature.

Tellurium (Te) has atomic number 52, atomic mass 127.6 u and electron configuration [Kr] 4d10 5s2 5p4.

[Download periodic table PDF](https://www.moldraw.com/printables/periodic-table.pdf)[Open interactive periodic table](https://www.moldraw.com/tools/free-chem-tools/interactive-periodic-table.html)

## Tellurium facts

| Symbol | Te |
| --- | --- |
| Atomic number | 52 |
| Atomic mass | 127.6 u (g/mol) |
| Category | metalloid |
| Group | group 16 (chalcogens) |
| Period | 5 |
| Block | p-block |
| Phase at 20 °C | Solid |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p4 |
| Noble-gas notation | [Kr] 4d10 5s2 5p4 |
| Electrons per shell | 2, 8, 18, 18, 6 |
| Valence electrons | 6 |

## Bohr model and shells

Tellurium has 52 electrons in 5 shells: 2, 8, 18, 18, 6. Full configuration and noble-gas notation are in the table; work out any element or ion with the [electron configuration calculator](https://www.moldraw.com/tools/free-chem-tools/electron-configuration-calculator.html).

## Physical and atomic properties

| Melting point | 722.66 K (449.5 °C) |
| --- | --- |
| Boiling point | 1261 K (987.9 °C) |
| Density | 6.24 g/cm³ |
| Electronegativity (Pauling) | 2.1 |
| Electron affinity | 190.161 kJ/mol |
| Ionization energies | 869.3, 1790, 2698 kJ/mol (1st, 2nd, 3rd) |
| Molar heat capacity | 25.73 J/(mol·K) |
| Discovered by | Franz-Joseph Müller von Reichenstein |

Use the atomic mass in the [molar mass calculator](https://www.moldraw.com/tools/free-chem-tools/molar-mass-calculator.html) for any formula containing Te.

## Position in the periodic table

Tap any element to open its page.

## Frequently asked questions

### What is the atomic mass of tellurium?

The atomic mass of tellurium is 127.6 u, so one mole of tellurium atoms weighs 127.6 g.

### What is the electron configuration of tellurium?

Tellurium has 52 electrons: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁴, or [Kr] 4d¹⁰ 5s² 5p⁴ in noble-gas notation. Electrons per shell: 2, 8, 18, 18, 6.

### How many valence electrons does tellurium have?

Tellurium has 6 valence electrons (group 16).

### Is tellurium a metal?

Tellurium is a metalloid: it has properties between metals and nonmetals.

### Where is tellurium on the periodic table?

Tellurium is in group 16 (chalcogens), period 5, in the p-block.

Data: [Periodic-Table-JSON](https://github.com/Bowserinator/Periodic-Table-JSON) (CC BY-SA 3.0); standard atomic weights from IUPAC (abridged). Values in brackets are the mass number of the longest-lived isotope.