First we know the difference between molecular geometry and electron geometry.
There is a total of 8 Valence electrons in which N contributes 5 electron 2 H contributes 2electron and one negative charge contribute 1 electron.
Hence NH2- Ion has a tetrahedral geometry.
Molecular geometry-arrangement of atoms in relation to a central atom in three dimensional space. It defines shape of molecule.
Electron geometry is the arrangement of electron groups. If lone pair of electrons not bonded to other atoms are located in the molecule this will change the molecular geometry not the electron geometry.
Content
NH2- molecular geometry
NH2-Lewis structure
NH2-electron geometry
NH2- bond angle
NH2-ion
[NH2 -] is a ion with negative charge. chemical name of NH2 is Azanide.
It is also known as ammonia ion or mono amide.
Molecular geometry of NH2
In NH2 two pairs of bonding and two pairs of non bonding electrons participating in the formation of molecule. The central nitrogen atom has two pairs of nonbonding electrons causes repulsion of both bonding pairs which pushes the bonds are closer to each other .so NH2 has bent or angular molecular geometry or shape .
Lewis structure of NH2 ion
From the Lewis structure of nitrogen we have two- two electrons bonding regions which show it has two lone pairs of electron.Also, two pair of electrons participate in the 2 H-H formation that show there are a total of 4 pairsof electron pair present.
Bond Angel of NH2-
As we know in NH2- molecule there is two lone pairs of electron present on the N atom and according to VSEPR theory lone pair strongly repel the bond pairs .Thus, both N-H bond pairs come closer to each other and occupy less space than two non-bonding lone pairs of electrons .That's why NH2- has a bond angle of 104.5′′
I hope this is easier to understand.
Anupriya
M.Sc(chem),B.Ed
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