On Molecular Geometry of Hydrazine and Electronegativity

[Kyoma]

Homework Statement

1. What is the molecular shape of Hydrazine N₂H₄ w.r.t. N atom?

2. H₂S and H₂O, which one has a larger bond angle?

2. The attempt at a solution

1. Trigonal Pyramidal is the answer given. But Hydrazine has 5 atoms around its central atom and I'm unable to fathom why is it in trigonal pyramidal.

2. H₂O is the answer as O is more electronegative. But why is this the case? I've checked the internet and nothing tells me why an electronegative central atom could cause a larger bond angle.

Thank you for your time.

 

[Borek]

Hint: hydrazine doesn't have a central atom.

Are you sure oxygen electronegativity plays a role here? Explanations I remember called mostly for steric effects.

 

[Kyoma]

Ah~ there are 3 H atoms and one pair of lone electrons around N.

Steric forces? The explanation given to me was electronegativity?

 

[Borek]

Ah~ there are 3 H atoms and one pair of lone electrons around N.

Sounds like ammonia, not hydrazine.

Steric forces? The explanation given to me was electronegativity?

Can't help it.