Molecular Geometry of SIH3-

The video tutorial explains how to draw the Lewis structure for the SIH3- ion. It begins by counting the valence electrons, placing the least electronegative element in the center, and arranging the hydrogens around it. The tutorial then discusses the molecular geometry, highlighting the trigonal pyramidal shape due to the lone pair on silicon. The electron geometry is tetrahedral, and the bond angles are slightly less than 109.5 degrees. The video concludes with a discussion on AXE notation and a summary of the molecular geometry.

What is the total number of valence electrons in the SIH3- ion?

• 8

• 12

• 10

• 6

Which element is placed at the center of the Lewis structure for SIH3-?

• Hydrogen

• Silicon

• Oxygen

• Carbon

How many valence electrons are used to form bonds between silicon and hydrogen in SIH3-?

• 4

• 6

• 8

• 2

What is the shape of the molecular geometry for SIH3-?

• Linear

• Tetrahedral

• Trigonal planar

• Trigonal pyramidal

What is the approximate bond angle in the trigonal pyramidal geometry of SIH3-?

• 90 degrees

• 109.5 degrees

• 120 degrees

• 180 degrees

How does the presence of a lone pair affect the molecular geometry of SIH3-?

• It changes the molecule to a linear shape.

• It has no effect.

• It decreases the bond angle.

• It increases the bond angle.

What is the electron geometry of SIH3-?

• Tetrahedral

• Octahedral

• Trigonal planar

• Linear

In AXE notation, what does 'A' represent for SIH3-?

• The number of lone pairs

• The number of bonds

• The central atom

• The total number of atoms

How many atoms are bonded to the central atom in SIH3- according to AXE notation?

• 1

• 2

• 3

• 4

What is the steric number of SIH3-?

• 4

• 2

• 3

• 5