---
title: "Rutherfordium (Rf): Atomic Mass, Electron Configuration & Properties"
url: https://www.moldraw.com/elements/rutherfordium.html
description: "Rutherfordium (Rf), element 104: atomic mass [267], electron configuration [Rn] 5f¹⁴ 6d² 7s², group 4, period 7, d-block transition metal. Melting and boiling point, density, electronegativity and shells."
lang: en
publisher: Scidart Academy
generated: 2026-11-03
---
104Rf[267]

# Rutherfordium (Rf) – element 104

Rutherfordium is a chemical element with the symbol **Rf** and atomic number **104**. It is a transition metal in group 4, period 7 of the periodic table (d-block), and is a solid at room temperature.

Rutherfordium (Rf) has atomic number 104, atomic mass [267] and electron configuration [Rn] 5f14 6d2 7s2.

[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)

## Rutherfordium facts

| Symbol | Rf |
| --- | --- |
| Atomic number | 104 |
| Atomic mass | [267] |
| Category | transition metal |
| Group | group 4 |
| Period | 7 |
| Block | d-block |
| Phase at 20 °C | Solid |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d2 |
| Noble-gas notation | [Rn] 5f14 6d2 7s2 |
| Electrons per shell | 2, 8, 18, 32, 32, 10, 2 |

## Bohr model and shells

Rutherfordium has 104 electrons in 7 shells: 2, 8, 18, 32, 32, 10, 2. 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 | 2400 K (2126.8 °C) |
| --- | --- |
| Boiling point | 5800 K (5526.9 °C) |
| Density | 23.2 g/cm³ |
| Ionization energies | 580 kJ/mol (1st) |
| Discovered by | Joint Institute for Nuclear Research |

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 Rf.

## Position in the periodic table

Tap any element to open its page.

## Frequently asked questions

### What is the atomic mass of rutherfordium?

The atomic mass of rutherfordium is [267] (mass number of its longest-lived isotope, since it has no stable isotope).

### What is the electron configuration of rutherfordium?

Rutherfordium has 104 electrons: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 6d², or [Rn] 5f¹⁴ 6d² 7s² in noble-gas notation. Electrons per shell: 2, 8, 18, 32, 32, 10, 2.

### Is rutherfordium a metal?

Yes. Rutherfordium is a transition metal.

### Where is rutherfordium on the periodic table?

Rutherfordium is in group 4, period 7, in the d-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.