well buddy im gonna tell u trick on how to calculate it .....
Geometry = 1/2 of ( valence e + number of monovalent atoms + charge on anion - charge on anion )
eg here valence e on central atom (here N) = 5, monovalent atoms = 0 ( oxygen is divalent ) , charge = -1
geometry = 1/2 ( 5 + 1) = 3
i.e sp2 trigonal planar
hope u know 2 = sp = linear
4 = sp3 = tetrahedral
5 = sp3d = trigonal bipyramidal
Easiest & quickest way to calculate !!!!! No need of even knowing the concepts :P
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trigonal planar
Molecular geometry refers to the arrangement of atoms in a molecule in three-dimensional space, taking into consideration the position of all atoms and lone pairs. Electronic geometry, on the other hand, refers to the arrangement of electron pairs around a central atom, including both bonding and non-bonding pairs. In many cases, the electronic geometry may differ from the molecular geometry due to the presence of lone pairs.
(NO3)- has three single bonds.
The formula for the salt containing both Ca and NO3 ions would be Ca(NO3)2. This is because calcium (Ca) has a 2+ charge and nitrate (NO3) has a 1- charge, so to balance the charges, you need two NO3 ions for each Ca ion.
The formula for the ionic compound formed by magnesium ions (Mg2+) and nitrate ions (NO3-) is Mg(NO3)2. The formula for the ionic compound formed by calcium ions (Ca2+) and nitrate ions (NO3-) is Ca(NO3)2.