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Boron exists in BCl3 form while Al can form Al206 because Al or aluminum is highly reactive. Aluminum has the property of being highly reactive with oxygen. This is why it forms Al206.

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Q: Why boron exist in BCl3 form while Al can form Al2O6?
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How do you write a formula for the compound of boron chloride?

Formula: BCl3


How many electron pairs are on the boron atom in BCl3?

There are exactly three electron pairs attached to the Boron atom, each one of them bonded to a chlorine atom as well.


What is the molecular shape of AlCl6?

It is a trigonal planar molecule; this resembles a 2D equilateral traingle with an Aluminium atom in the middle and the 3 chlorine atoms situated at each of the 3 points on the triangle. The bond angles are 120 degrees. Other examples of trigonal planar molecules are boron trifluoride (BF3) or boron trichloride (BCl3). It is a trigonal planar molecule; this resembles a 2D equilateral traingle with an Aluminium atom in the middle and the 3 chlorine atoms situated at each of the 3 points on the triangle. The bond angles are 120 degrees. Other examples of trigonal planar molecules are boron trifluoride (BF3) or boron trichloride (BCl3).


Why BCl3 does not form a double bond with one chlorine atom and single bond with other two chlorine atoms?

BCl3 has three single bonds because with 3 single bonds the formal charges of all the atoms are zero. With one double bond and two single bonds the formal charges are incorrect because Cl is more electronegative than B, yet it has a positive formal charge. Despite the incomplete octet on Boron when the structure has three single bonds, the formal charge is still better and formal charge is more important than complete octets.


Why is the nitrogen trichloride molecule pyramidal shape but boron trichloride molecule trigonal planar?

Nitrogen, has 5 electrons in its outer shell, Boron has only 3. When Nitrogen Bonds with 3 Chlorine atoms, to become NCl3, it still has 2 electrons left in its outer shell, which form a lone pair. As these could bond to a single proton, (i.e. hydrogen without its electron) they have to be shown in the diagram. NCl3 therefore has 3 bonds and 1 lone pair, so 4 things to show in the bond diagram. Making it trigonal pyramidal. However, Boron only has 3 electrons to bond. As these are all used up in the bonds with chlorine, there are only 3 bonding pairs to show in the diagram. Therefore it is trigonal planar. NCl3 has bond angles of 107 degrees whereas BCl3 has bond angles of 120 degrees. Hope this helps.