Table of Contents
Why no nf5 and NCl5 exist?
Answer: Explanation: Nitrogen due to its small size and absence of d orbital cannot expand its covalency beyond 4 and hence cannot accommodate 5 electrons from Cl or F as in this case.
Why is NCl5 an unstable compound?
Nitrogen is the first element of group-15 element of p-block. Hence, the nitrogen atom is devoid of any sort of d orbital. Therefore, it can not extend it’s octet & hence can not accept 5 more electrons from the 5 chlorine atoms in whatever energy state it is. Thus, N can not form NCl5 compound.
Can NCl5 be formed?
Phosphorus forms PCl5 while nitrogen cannot form NCl5 .
Why nitrogen can only form NCl3 but not NCl5?
There is no vacant d-orbital in the outermost orbit of Nitrogen. There are valent d-orbitals in the outer most orbit of phosphorus and hence it shows variable covalence 3 and 5 in ground state and excited state respectively. Hence nitrogen forms only NCl3 but phosphorus forms PCl3 and PCl5 both.
Why does PF5 exist but not nf5?
Nitrogen does not have any 2d orbitals in its valence shell. Therefore, it cannot extend its covalency upto five. But in case of phosphorus, vacant 3d orbitals are present. As a result, phosphorus can extend its covalency upto five and a molecule of PF5 can exist.
Why is PCl5 formed?
In PCl5 the 5sp3d orbitals of phosphorus overlap with p orbitals of chlorine atoms. The p orbitals are singly occupied. Together they form 5 P–Cl sigma bonds.
Why is PCl5 stable?
Answer: PCl5 is unstable because phosphorus forms 5 bonds with cl atoms out of which the two axial bonds have more Bond length than three equatorial Bond length this result in repulsion and thereby making the axial bonds weak.
Why does nf5 not possible?
According to the electronic configuration of nitrogen, it does not have 3d orbital that’s why it can’t expand the valency up to 5 and does not form NF5. N does not have vacant d orbitals. Hence, there is no excitation of ns2 electron to vacant orbitals.
Why nitrogen does not form Pentahalides?
The nitrogen valence shell is L –shell. L shell doesn’t hold d-orbitals, so Nitrogen doesn’t have vacant d-orbitals, so it cannot form expanded octet configuration. So, Nitrogen is unable to give pentahalides, Nitrogen only forms trihalides.
Why does not nitrogen forms Pentahalides like PCl5?
(1) Nitrogen does not form pentahalides because it has no vacant d-orbitals in its valence shell.
Why does PCl3 and PCl5 exist?
Phosphorus is a period 3 element. Hence it has an empty d-orbital which the period 2 elements do not have. As phosphorus initially has valency as 3 it forms PCl3, and due to this expanded octet, PCl5 can also be formed.
Which of the following elements can be involved in P pi dpi bonding?
Phosphorus belongs to 3rd period and hence contains d-orbitals which can form pπ−dπ bonds.