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Why is the nitrogen trichloride molecule pyramidal shape but boron trichloride molecule trigonal planar?
Wiki User
∙ 10y ago
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.
Wiki User
∙ 10y ago
Wiki User
∙ 9y agoThere are three bonding pairs and one bonding pair of electron around the central nitrogen atom. The ammonia molecule is trigonal pyramidal as non-bonding electron pairs repel more than bonding electron pairs.
Wiki User
∙ 13y agobecause the lone pair shoves the other atoms closer to each other
Wiki User
∙ 9y agoThere is a lone pair.It makes NH3 pyramidal.
Wiki User
∙ 9y agoThe nitrogen in ammonia has 5 valence electrons and bonds with three hydrogen atoms to complete the octet.
Wiki User
∙ 10y agoThere is a lone pair.It repels the bonds and make the shape pyramidal.
Wiki User
∙ 9y agoNH3 has a lone pair.So NH3 is pyramidal.
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