Oganesson (Og)

Element 118 · noble gas · group 18, period 7

Electron shells, 2 + 8 + 18 + 32 + 32 + 18 + 8. The outer shell is highlighted - it is the only one that takes part in bonding.

Oganesson is element 118, a noble gas in group 18 and period 7. Its electron configuration is [Rn] 5f14 6d10 7s2 7p6. That leaves 8 valence electrons in the outer shell, with the shells filling 2, 8, 18, 32, 32, 18, 8. Its outer shell is already full, so it does not normally form ions at all.

118 protons
8 valence e−
p-block

Properties

Atomic number	118
Symbol	Og
Standard atomic weight	294 u
Group	18
Period	7
Block	p-block
Category	noble gas
Electron configuration	1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 6d¹⁰ 7s² 7p⁶
Noble-gas notation	[Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁶
Electrons per shell	2, 8, 18, 32, 32, 18, 8
Valence electrons	8
Common ionic charge	none
Electronegativity (Pauling)	no accepted value
Protons / electrons	118 / 118

Electron configuration of oganesson

Orbitals fill from the lowest energy upward. Writing that out for oganesson gives 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 6d¹⁰ 7s² 7p⁶, which is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d10 7s2 7p6 in plain text.

Everything up to Rn is the same as in that noble gas, so it is usually abbreviated to [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁶. The part outside the bracket is what does the chemistry.

Subshell	Electrons	Capacity
1s	2	2
2s	2	2
2p	6	6
3s	2	2
3p	6	6
3d	10	10
4s	2	2
4p	6	6
4d	10	10
4f	14	14
5s	2	2
5p	6	6
5d	10	10
5f	14	14
6s	2	2
6p	6	6
6d	10	10
7s	2	2
7p	6	6

Oganesson ion charge

Oganesson does not normally form ions. Its outer shell is already full, so there is nothing to gain by losing or gaining an electron.

Common questions

How many valence electrons does oganesson have?

Oganesson has 8 valence electrons. For a main-group element the count is the group number minus 10, and oganesson is in group 18.

What is the electron configuration of oganesson?

1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d10 7s2 7p6, or [Rn] 5f14 6d10 7s2 7p6 written from the previous noble gas. Orbitals fill lowest energy first.

How many protons, electrons and neutrons does oganesson have?

A neutral oganesson atom has 118 protons and 118 electrons. Its standard atomic weight is 294, so the most common isotope has about 176 neutrons.

See the ionic charge of every element →

How this page was produced. The configuration was built by filling orbitals in energy order from atomic number 118 alone, not looked up. The shell counts, the valence count and the charge all follow from it. Nothing on this page is written per element.

Subshell	Electrons	Capacity
1s	2	2
2s	2	2
2p	6	6
3s	2	2
3p	6	6
3d	10	10
4s	2	2
4p	6	6
4d	10	10
4f	14	14
5s	2	2
5p	6	6
5d	10	10
5f	14	14
6s	2	2
6p	6	6
6d	10	10
7s	2	2
7p	6	6

Subshell	Electrons	Capacity
1s	2	2
2s	2	2
2p	6	6
3s	2	2
3p	6	6
3d	10	10
4s	2	2
4p	6	6
4d	10	10
4f	14	14
5s	2	2
5p	6	6
5d	10	10
5f	14	14
6s	2	2
6p	6	6
6d	10	10
7s	2	2
7p	6	6