10 2 · 8

Neon, Ne, element 10

Noble gas· Period 2· Group 18· p-block

Configuration [He]2s22p6

Atomic weight
20.1797Da
Phase
gas
Density
8.25×10−4g/cm³
Melting point
24.56K -248.59 °C
Boiling point
27.104K -246.05 °C
Electronegativity
No data

Colourless gaseous element of group 18 on the periodic table (noble gases). Neon occurs in the atmosphere, and comprises 0.0018% of the volume of the atmosphere. It has a distinct reddish glow when used in discharge tubes and neon based lamps. It forms almost no chemical compounds. Neon was discovered in 1898 by Sir William Ramsey and M.W. Travers. Description from mendeleev.

Back to the table
The outermost shell: the valence electronsThe inner shellsThe nucleus One bead for each electron, on the ring of its shell, counted from the nucleus out. The rings turn at their own pace; the model is Bohr's picture of the atom, which places electrons in shells but not on true orbits.

Atomic properties

5 of 5 fields have a value for neon

Atomic weight The standard atomic weight. For an element with no stable isotope, the mass of its longest-lived isotope.
20.1797Da
Source: mendeleev
Electron configuration
[He]2s22p6
Source: mendeleev
Uncertainty of the atomic weight
6×10−4Da
Source: mendeleev
Electron configuration in full The electron configuration with the noble-gas core written out.
1s22s22p6
Source: Worked outfrom electron configuration
Electrons in each shell Counted from the electron configuration, from the first shell outward.
2 · 8
Source: Worked outfrom electron configuration

Screening of each subshell

Clementi's screening constants: how much of the nucleus's charge the other electrons hide from an electron in each subshell. What is left is the effective nuclear charge it feels.

SubshellScreening σEffective charge Z − σ
1s0.35799.6421
2s4.24165.7584
2p4.24165.7584