How many bonding domains are required around a central atom for a molecule to adopt a $\mathrm{tetrahedral}$ geometry?

• A. $5$
• B. $2$
• C. $4$
• D. $3$

Answer: (C)

Verified step by step guidance

1. Understand that the term 'bonding domains' refers to regions of electron density around the central atom, typically bonds to other atoms or lone pairs of electrons.
2. Recall that molecular geometry is determined by the arrangement of these electron domains to minimize repulsion, according to VSEPR (Valence Shell Electron Pair Repulsion) theory.
3. Identify that a tetrahedral geometry arises when there are four bonding domains around the central atom, arranged as far apart as possible in three-dimensional space.
4. Note that these four bonding domains correspond to four single bonds or equivalent electron groups around the central atom.
5. Conclude that the number of bonding domains required for a tetrahedral geometry is four, as this arrangement leads to bond angles of approximately 109.5 degrees.