10 Ne Neon 20.18 u

Neon

周期
2
族
18
ブロック
p-ブロック
相 (STP)
Gas

Neon is a noble gas known for its bright reddish-orange glow in neon signs. It is the fifth most abundant element in the universe.

外観: 無色の気体（放電時に赤橙色の発光）

About Neon

Best known for the reddish-orange light it emits when electrified, neon is an inert noble gas of atomic number 10 and atomic mass 20.18. Its electrons completely fill the second shell ([He] 2s2 2p6), a closed configuration that leaves eight valence electrons, no tendency to bond, and a very high ionization energy of 2081 kJ/mol. The colorless gas liquefies at 27 K. William Ramsay discovered it in 1898. Though neon is the fifth most abundant element in the universe, it is scarce in Earth's air, and its characteristic glow in gas-discharge tubes became the basis of illuminated signage. Neon sits in group 18, period 2.

物理的特性

原子質量 20.18 u
密度 0.0008999 g/cm³
融点 -248.6 °C
沸点 -246.0 °C
STPにおける相 Gas
原子半径 38.0 pm

電子的特性

イオン化エネルギー 2080.7 eV
価電子 8

電子配置

配置 [He] 2s² 2p⁶

Electron Shell Configuration

Neon electron shell configuration Ne 2e⁻ 8e⁻
Electron shell structure of Neon — electrons per shell.
Shell Electrons
1 (K) 2
2 (L) 8

Position in Periodic Table

Neon position in the periodic table Ne

発見

発見者: William Ramsay
年: 1898

ブロックと周期

ブロック

s p d f

周期

1 2 3 4 5 6 7

周期表

ランタノイド アクチノイド

希ガス をもっと見る

2 He Helium 18 Ar Argon 36 Kr Krypton 54 Xe Xenon 86 Rn Radon

Frequently Asked Questions

What is Neon?
Neon (Ne) is a chemical element with atomic number 10. It is a gas at standard temperature and pressure, classified as a 希ガス.
What are the key properties of Neon?
Neon has an atomic mass of 20.18 u, density of 0.0008999 g/cm³, melting point of -248.6°C, boiling point of -246.0°C.
What is the electron configuration of Neon?
The electron configuration of Neon is [He] 2s2 2p6. It is in the p-block of the periodic table.
Who discovered Neon?
Neon was discovered by William Ramsay in 1898.