Why NCl3 is not formed but NF5 is formed ?
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It has 5 electrons in its outer most orbit,but take a look at the electronic configuration . It has 3 electrons in 2p orbital. Since there is no vacant 2d orbital (which is also not possible,it does not exist) to complete it's octet , that means to expand so N can only form NF3 not NF5.
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