We can determine the electron geometry and bond angle using this:

**Electron Regions Electronic Geometry Bond Angles**

2 linear 180˚

3 trigonal planar 120˚

4 tetrahedral 109.5˚

5 trigonal bipyramidal 90˚, 120˚, and 180˚

6 octahedral 90˚ and 180˚

**Completing the given Lewis structure: **

- C prefers to form
**4 bonds**(Grp 4A) - N prefers to form 3 bonds (Grp 5A)
- add
**a lone pair**to each N to satisfy octet rule*(8 val. e*^{-})

- add
- H forms only 1 bond (Grp 1A)

**N (in C-N-N) is surrounded by:**

**4 electron groups**: 3 bonds and 1 lone pair →**tetrahedral**

The atoms of the compound methylhydrazine, CH_{6}N_{2} which is used as a rocket propellant, are connected as follows:

What do you predict for the ideal values of the C-N-N and H-N-H angles, respectively?