---
title: "Neon (Ne): Atomic Mass, Electron Configuration & Properties"
url: https://www.moldraw.com/elements/neon.html
description: "Neon (Ne), element 10: atomic mass 20.18, electron configuration [He] 2s² 2p⁶, group 18, period 2, p-block noble gas. Melting and boiling point, density, electronegativity and shells."
lang: en
publisher: Scidart Academy
generated: 2026-11-03
---
10Ne20.18

# Neon (Ne) – element 10

Neon is a chemical element with the symbol **Ne** and atomic number **10**. It is a noble gas in group 18 (noble gases), period 2 of the periodic table (p-block), and is a gas at room temperature.

Neon (Ne) has atomic number 10, atomic mass 20.18 u and electron configuration [He] 2s2 2p6.

[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)

## Neon facts

| Symbol | Ne |
| --- | --- |
| Atomic number | 10 |
| Atomic mass | 20.18 u (g/mol) |
| Category | noble gas |
| Group | group 18 (noble gases) |
| Period | 2 |
| Block | p-block |
| Phase at 20 °C | Gas |
| Electron configuration | 1s2 2s2 2p6 |
| Noble-gas notation | [He] 2s2 2p6 |
| Electrons per shell | 2, 8 |
| Valence electrons | 8 |

## Bohr model and shells

Neon has 10 electrons in 2 shells: 2, 8. 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 | 24.56 K (-248.6 °C) |
| --- | --- |
| Boiling point | 27.104 K (-246.0 °C) |
| Density | 0.9002 g/L |
| Electron affinity | -116 kJ/mol |
| Ionization energies | 2080.7, 3952.3, 6122 kJ/mol (1st, 2nd, 3rd) |
| Discovered by | Morris Travers |

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 Ne.

## Position in the periodic table

Tap any element to open its page.

## Frequently asked questions

### What is the atomic mass of neon?

The atomic mass of neon is 20.18 u, so one mole of neon atoms weighs 20.18 g.

### What is the electron configuration of neon?

Neon has 10 electrons: 1s² 2s² 2p⁶, or [He] 2s² 2p⁶ in noble-gas notation. Electrons per shell: 2, 8.

### How many valence electrons does neon have?

Neon has 8 valence electrons (group 18).

### Is neon a metal?

No. Neon is a nonmetal (noble gas).

### Where is neon on the periodic table?

Neon is in group 18 (noble gases), period 2, 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.