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Sagot :
Answer: Trigonal Pyramidal
Explanation: So, firstly we should eliminate the answers that don't work. It can't be linear since there are 4 atoms. We can assume that it can't be linear since those tend to be the geometry of compounds with few atoms.
So we are left with trigonal pyramidal, trigonal planar, and tetrahedral. To help us out, we should attempt to draw the MDG.
Firstly, we have to find the center atom. We must find the most electronegative atom, Hydrogen or Nitrogen. A simple way to find the most electronegative atom is to start at the bottom left of the Periodic Table and go diagonally to the top right. Therefore, Nitrogen would be the most electronegative. So we know that Nitrogen is the center atom.
Since Hydrogen only needs two atoms to have a full octet, they will only create a singular bond. Therefore we can determine that all the Hydrogens will pair with the Nitrogen. Looking at the numbers above the periodic table, the Hydrogens will contribute with one atom each. And the Nitrogen will contribute with 5 atoms. Therefore we have 8 atoms in total. So we can do the following diagram.
H
I
H -- N -- H
But the problem with this diagram is that there are 6 atoms used in total since the dashes do 2 atoms. The Nitrogen also does not have a full octet. Therefore we must put two atoms on the bottom of Nitrogen. This leads to the only possible answer, Trigonal Pyramidal.
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