why there is a need to write a subscript with non-metals like O subscript 2 in a chemical reaction?

Asked by mrinalchatterjee | 2nd May, 2010, 01:25: PM

Expert Answer:

See, if you write O it means oxygen atom.

Oxygen does not exist as oxygen atom but as oxygen molecule.

You know that oxygen is a non- metal i.e. it is an element . In elemental state or existing as a non- metal, oxygen exists as oxygen molecule. SO, we write O2.  Oxygen molecule is oxygen gas.

Similary . hydrogen element , hydrogen non - metal or hydrogen gas we write H2 and not H.

Also, chlorine element , chlorjne non - metal or chlorine gas we write H2 and not H.

 

Answered by  | 3rd May, 2010, 08:57: AM

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