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I'm not an expert teacher or lecturer of chemistry. I was only a student from SMA NEGERI 15 SURABAYA who had been one of the Bronze Medalist Participants of Olimpiade Sains Nasional X (2011) of Chemistry In Manado, North Sulawesi, 11 - 16 September 2011 and graduated in 2012. Now, I'm studying at Universitas Airlangga in Surabaya, Indonesia. I do love chemistry and I would like to help them who had difficulties in studying chemistry. That's why, please understand me if you found some misconcepts in my entries. Suggestions are always necessary in order to develop this blog. And I'm sorry because my English isn't so well.

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Friday, April 20, 2012

Some Non-Hybridizated Molecules

Hybridization theory is one of molecule theories that helps us to understand how atoms can form a molecule. But some molecules not form a state of hybridization first to form a molecule because of their condition that make an impossible condition to form the hybridization. One example of them are PH3 (Phosphine).

You know what is the geometry structure of Ammonia gas? It is Pyramid Trigonal, isn't it? and the angle of H - N - H is about 107.50, right?
The geometry structure of PH3 gas is like T-shape and has the H - P - H angle about 900. Why can it be?

The reason is, the size of Phosphorus atom is larger than Nitrogen and of course is so large for Hydrogen atom. The prove is, the radius of Phosphorus atom is about 100 pm, Nitrogen atom is about 65 pm, and Hydrogen atom is about 25 pm.

So how they form a molecule?
They just attached each other. The 1s1 electron of hydrogen atoms is making an electrostatic interaction between the 3p electrons of Phosphorus. The picture below may make an easier illustration for us:



Thank you.
Source:
Documents of Pelatnas 2 IChO 2012


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