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How to write chemical formula of a compound?

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Please go through your NCERT texts.
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Tutor Biology

Just check the IUPAC nomenclature in NCERT book.
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Trainer

Using cross valency method like Al2O3.
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Tutor

You should know the elements symbles and valancy of the elements, then you can write. e.g. aluminium chloride formula is AlCl3, see here aluminium symble is Al and valancy is 3 and chlorine valancy is 1 so 3 chlorines can bond with Aluminium.
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Concept Clearance

First check the valency of given element.....and interchange within the element.
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Math Educator for Std.11th ,12th , Engineering Entrance and Degree Level with 11+ Years Experience

To write chemical formula of a compound, knowledge of symbol and valency of elements are required.
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As we know that, single GM between two numbers a and b will be +(root (a*b)), Could anybody tell me, why not -- (root (a*b)) While, 4 8 16 and 4 -8 16 both are in GP.
There are two parts to your question. 1. Can a GM be negative. 2. Does the calculation follow from this formula which you have stated. Answer to the first part is yes. GM can be negative. Answer...
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