Question

What is the molecular shape of a silane molecule, $Si{{H}_{4}}$ ?

Answer 1

Hint : Molecular shape (molecular geometry) is the three dimensional arrangement of the atoms that constitute a molecule. Several properties of a substance like reactivity, polarity, color, phase of matter, magnetism are highly influenced by its molecular geometry.

Complete Step By Step Answer:
Molecular shape is determined using VSEPR( Valence Shell Electron Pair Repulsion) theory, around the central atom all regions of electrons repel each other to get as far away from each other as possible while pivoting around the central atom .
Double bonds and triple bonds count as a single region of electrons.
The hybridization of silane of Silicon tetrahydride is $s{{p}^{3}}$ .
Write the Lewis dot structure for the formula.
Determine the steric number of the central atom .
Decide on the electron pair orientation based on the steric number.
Consider the placement of lone pairs and any distortions from regular shapes.
The molecular geometry of $Si{{H}_{4}}$ is tetrahedral with symmetric charge distribution around the central atom. This molecule is also non-polar.

Note :
Silane is a colorless, flammable and poisonous gas, with a strong repulsive odor. It is very toxic by inhalation and is a strong irritant to skin, eyes and mucous membranes. Silane is lighter than air.