From the valence electrons of the elements in a compound formed by a reaction, you can predict:
- Bond type between the atoms (e.g., ionic, covalent)
However, the other options can also be related to valence electrons, but they are not as directly predictable:
- Number of bonds between the atoms can be inferred but is not as straightforward as bond type.
- Electronegativity difference between the atoms can be related to bond type, but it is not a direct prediction from valence electrons alone.
- Absolute electronegativity of the atoms is not directly predictable from valence electrons.
Therefore, the most appropriate answer would be bond type between the atoms.