Difference Between 2O and O2

Thekey differencebetween 2O and O₂is that2O refers to two freeoxygenatoms, whereas O₂refers to a molecule having two oxygen atoms.

2O and O₂are two terms that often confuse us. Both terms mean that there are two oxygen atoms. But, the difference between 2O and O2 is the state of these oxygen atoms – whether they are free or bound to each other.

CONTENTS

1.Overview and Key Difference
2.What is 2O
3.What is O₂
4.Side by Side Comparison – 2O vs O₂in Tabular Form
5.Summary

What is 2O?

2O means there are two atoms of oxygen. There, each oxygen atom does not bond with each other, and they are in a free state. Here, the oxygen is in the elemental state. Further, these oxygen atoms are available for the formation of chemical bonds.

What is O₂?

O₂is a molecule of oxygen having two oxygen atoms bound to each other viacovalent chemical bonding。Here, the oxygen is in themolecular state。此外,氧原子的结构already in chemical bonds. Thus, no further bonds will form between them. Importantly, we should write the 2 as a subscript of O: “O₂”.

Moreover, this compound occurs in the gaseous state, and it is essential for life on earth since we breathe in oxygen gas.

What is the Difference Between 2O and O2?

Although both the terms 2O and O₂means there are two oxygen atoms, the state of oxygen is different. The key difference between 2O and O₂is that 2O means there are two free oxygen atoms, whereas O₂means it is a molecule having two oxygen atoms. Further, 2O is in the elemental state while O2 is in the molecular state. Importantly, when writing them, we usually write 2 in 2O in the same font size as O, but in O₂, we should write the 2 as a subscript of O.

Below info-graphic summarizes the difference between 2O and O₂。

Summary – 2O vs O₂

Although both the terms 2O and O₂means there are two oxygen atoms, the state of oxygen is different. In summary, the key difference between 2O and O₂is that 2O means there are two free oxygen atoms, whereas O₂means it is a molecule having two oxygen atoms.

Reference:

1.“Oxygen Molecule.”National Center for Biotechnology Information. PubChem Compound Database, U.S. National Library of Medicine,Available here。

Image Courtesy:

1. “Electron shell 008 Oxygen – no label” By Pumbaa (original work by Greg Robson) – File:Electron shell 008 Oxygen.svg(CC BY-SA 2.0 uk)viaCommons Wikimedia
2. “Dioxygen-montage” (Public Domain) viaCommons Wikimedia