Please explain me how nh3 work as legand?

basically im weak in this section, can you tell me how nitrogen have a loan pair in case of NH3, Nitrogen have 7 electron & H have 3 & hence their octate gets completed, then how do loan pair comes , ?

its configuration become like neon, so why any molecule like to loose inert gas like conditions by loosing electron

Valency=no. of bonds to be formed to complete it's octet. And lone pair are those electrons which don't participate in bond formation but these lone pair are responsible for their basic nature.

Nh3 donates its lone pair of electrons to metal ion

And form coordination bond..as you know in coordination bond the required 2 electrons for bonding comes from only one atom

Like this

Got it anand??

in case of F- i can say that its octate is complete and it is stable so it can donate loan pair but in case of NH3 it will lose its stability na

Here we consider NH3 as a molecule na...It has one lone pair of electrons after coordination bonding also...it completes its octet

you tell anand in coordination bond octet is conpleted or not??

can you explain me in case of CN-

or CO

Here different cases arises as these all are Pi acid ligands backbonding case

Simply you considered na ligand acts as a lewis base and donates its electrons pair

Through co-ordinate covalent bond

See this

Nh3 completes octate by 2p6 and if it donate electeron it will become instable na

in case of F- it is stable and can donate pair but how it is in case of nh3