Question

note: to answer some of the questions, it may help to reference a periodic table
what could cause the bond angles to differ between molecules?
(select all that apply)
the number of lone pairs of electrons on the central atom
the size of the central atom in the bond
the number of valence electrons transferred from the central atom
the number of bonding pairs of electrons on the central atom

Explanation:

• Lone pairs of electrons: Lone pairs exert greater repulsion than bonding pairs. For example, in \(H_2O\) (central atom \(O\) has 2 lone pairs) and \(NH_3\) (central atom \(N\) has 1 lone pair), the bond angles are affected by the number of lone pairs. The greater the repulsion from lone pairs, the more the bonding pairs are pushed closer together, altering the bond angle.
• Bonding pairs of electrons: The number of bonding pairs influences the electron - pair geometry. For instance, in \(CH_4\) (4 bonding pairs, tetrahedral geometry with bond angles of \(109.5^{\circ}\)) and \(BF_3\) (3 bonding pairs, trigonal planar geometry with bond angles of \(120^{\circ}\)), the different numbers of bonding pairs lead to different electron - pair arrangements and thus different bond angles.
• Size of the central atom: A larger central atom can accommodate bonding pairs at different angles. For example, in \(SnCl_2\) (where \(Sn\) is larger compared to some other central atoms in similar - type compounds), the bond angle is affected by the size of \(Sn\) as it influences the spatial arrangement of the bonds.
• Number of valence electrons transferred: This is not a direct factor. Bond angles are more related to the electron - pair geometry (determined by bonding and lone pairs) rather than just the number of valence electrons transferred. Valence electrons transferred may be related to the formation of ions, but in molecular geometry (which determines bond angles), it is the electron - pair repulsions (from bonding and lone pairs) and the size of the central atom that play key roles.

Answer:

the number of lone pairs of electrons on the central atom, the size of the central atom in the bond, the number of bonding pairs of electrons on the central atom