Difference Between Bromine and Iodine | Bromine vs Iodine


The key difference between bromine and iodine is that bromine is in the liquid state at room temperature whereas iodine is in the solid state.

Bromine and iodine are elements in the halide group or the group 17 of the periodic table. Therefore, both these elements have 7 electrons in their outermost electron shell.

Difference Between Bromine and Iodine | Bromine vs Iodine

CONTENTS

1. Overview and Key Difference
2. What is Bromine
3. What is Iodine
4. Similarities Between Bromine and Iodine
5. Side by Side Comparison – Bromine vs Iodine in Tabular Form
6. Summary

What is Bromine

Bromine, denoted by Br, is a halide having the atomic number 35. And at room temperature, it is a brownish-red liquid. Its vapour is also brown colored and has a pungent odor. Moreover, it is the only nonmetal that is in the liquid state at room temperature. This liquid has Br2 molecules. Further, it is chemically less reactive than chlorine and fluorine but is more reactive than iodine.

Some Chemical Facts about Bromine

  • Symbol = Br
  • Atomic number = 35
  • Atomic mass = 79.904 amu
  • Electron configuration = [Ar] 3d104s2 4p5
  • Position in periodic table =group 17, period 4
  • Block = p block
  • Physical state = a brownish-red liquid at room temperature
  • Melting point = -7.2°C
  • Boiling point = 58.8°C
  • Electronegativity = 2.8 (Pauling scale)
  • Oxidation states = 7, 5, 4, 3, 1, −1
Difference Between Bromine and Iodine | Bromine vs IodineFigure 1: Bromine in a Secured Vial

Bromine is a naturally occurring nonmetal and is present in bromine-rich brine deposits in countries like USA and China. Electrolysis is the common method adopted in the extraction of this element from brine deposits. Bromine was the first element extracted from seawater. However, it is not a popular method nowadays.

What is Iodine

Iodine (I) is a halide having the atomic number 53. And it is in the solid state at room temperature and pressure. Furthermore, it is a nonmetal in the p block of the periodic table of elements.

Some Chemical Facts about Iodine

  • Symbol = I
  • Atomic number = 53
  • Atomic mass = 126.904 amu
  • Electron configuration = [Kr] 4d105s2 5p5
  • Position in periodic table =group 17, period 5
  • Block = p block
  • Physical state = a black shiny crystalline solid at room temperature
  • Melting point = 113.7°C
  • Boiling point = 184.4°C
  • Electronegativity = 2.66 (Pauling scale)
  • Oxidation states = 7, 6, 5, 4, 3, 1, −1
Difference Between Bromine and Iodine | Bromine vs IodineFigure 2: Iodine Crystals

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