10
Ne
Neon
20.17976
Neon
NOBLE GAS
Bohr Model: Electrons arranged in energy shells around the nucleus.
Neon is a chemical element with symbol Ne and atomic number 10. It is in group 18 (noble gases) of the periodic table. Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air.
Quick Facts
Atomic Number 10
Period 2
Group 18
Phase Gas
Appearance colorless gas exhibiting an orange-red glow when placed in a high voltage electric field
About Noble Gass
Noble gases are colorless, odorless, and extremely unreactive (inert) due to having full valence electron shells.
History
Discovered By Morris Travers
Named By Unknown
Physical Properties
Atomic Mass 20.17976
Density 0.9002 g/L
Molar Heat N/A J/(mol·K)
Phase Transition (Melting & Boiling Points)
Neon melts at 24.56 K and boils at 27.104 K.
Atomic Properties
Electron Config [He] 2s2 2p6
Electronegativity N/A
Electron Affinity -116 kJ/mol
Ionization Energy 2080.7 kJ/mol
Orbital Filling Diagram
This diagram visualizes electron configuration according to the Aufbau principle and Hund's rule.
Boxes represent orbitals (s, p, d, f), while arrows indicate electrons with spin up or down.
Electrons fill lower energy levels first and occupy orbitals singly before pairing.
Emission Spectrum
Photograph
External Resources
Study Guide
Atomic Number
The number of protons in the nucleus, which defines the element.
Atomic Mass
The average mass of an atom, including protons and neutrons.
Electronegativity
A measure of how strongly an atom attracts electrons in a bond.
Ionization Energy
The energy required to remove an electron from an atom.
Electron Config
The arrangement of electrons in the atom's energy shells.