Electronic configuration of neon

Electrons in each shell

Neon has 10 electrons arranged as 2, 8 across 2 shells, which is why it sits in period 2.

How to write it

Electrons fill orbitals in order of increasing energy: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p… Each s orbital holds 2 electrons, p holds 6 and d holds 10. Placing Neon's 10 electrons in that order gives 1s² 2s² 2p⁶.

Neon at a glance

Atomic number	10
Symbol	Ne
Atomic mass	20.180 u
Group	18
Period	2
Block	p-block
Category	Noble gas
Valence electrons	8

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Other elements in group 18

Elements in the same group have the same number of outer electrons, which is why they behave alike.