Mendeleev فارسی

Bromine (Br) – Element 35 of the periodic table

Bromine (symbol Br) is element number 35 of the periodic table and belongs to the “Halogen” category. Its atomic mass is about 79.904, and its phase under standard conditions is Liquid. This element sits in period 4 and group 17 of the periodic table, and its electrons are arranged in shells of 2, 8, 18, 7. The short electron configuration of Bromine is [Ar] 3d¹⁰ 4s² 4p⁵. Known uses of Bromine include Photography, Disinfection and Gasoline additive.

View in the interactive periodic tableAsk the AI assistant

Properties of Bromine

Atomic number
35
Chemical symbol
Br
Atomic mass
79.904
Category
Halogen
Period
4
Group
17
Phase
Liquid
Protons
35
Electrons
35
Neutrons (approx.)
45
Electron shells
2, 8, 18, 7
Outer-shell electrons
7
Discovered
Antoine Jérôme Balard (1826)

Electron configuration of Bromine

The electron configuration of Bromine (Br), with 35 electrons, is shown below. The last shell (shell 4) is highlighted:

Full configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁵
Short configuration
[Ar] 3d¹⁰ 4s² 4p⁵
Last shell
4s² 4p⁵

What is electron configuration and how is it written?

Electron shells of Bromine

Distribution of 35 electrons of Bromine across shells K to N:

  1. K2
  2. L8
  3. M18
  4. N7

What is a halogen?

The halogens are the group 17 elements: highly reactive nonmetals that form salt compounds with metals.

Uses of Bromine

Frequently asked questions about Bromine

What is the atomic number of Bromine?

The atomic number of Bromine (Br) is 35; that is, every atom of it has 35 protons.

What is the electron configuration of Bromine?

The electron configuration of Bromine (Br) is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁵; in short form it is [Ar] 3d¹⁰ 4s² 4p⁵, and its last shell is 4s² 4p⁵.

What is the chemical symbol of Bromine?

The chemical symbol of Bromine is Br.

Where is Bromine located in the periodic table?

Bromine is located in period 4 and group 17 and belongs to the “Halogen” category.

What is the atomic mass of Bromine?

The atomic mass of Bromine is about 79.904 (atomic mass units).

What is the phase of Bromine under normal conditions?

The phase of Bromine under standard conditions is Liquid.

What are the uses of Bromine?

Uses of Bromine include Photography, Disinfection and Gasoline additive.

Who discovered Bromine?

Bromine was discovered by Antoine Jérôme Balard in 1826.

Elements in the same category as Bromine (Halogen)

Fluorine (F)Chlorine (Cl)Iodine (I)Astatine (At)Tennessine (Ts)

See all Halogens

Bromine’s group 17 neighbours

Fluorine (F)Chlorine (Cl)Iodine (I)Astatine (At)Tennessine (Ts)

Group 17 of the periodic table