Answer
The possible identities for the unknown element E are boron (B) or aluminum (Al), and the predicted molecular structure is a trigonal planar arrangement with bond angles of approximately 120 degrees.
Work Step by Step
Based on the given Lewis structure, the unknown element E can be one of the following possible identities:
1. Boron (B):
- Boron has an electron configuration of 1s^2 2s^2 2p^1, which allows it to form three covalent bonds.
- In the given Lewis structure, the central atom E is surrounded by three fluorine atoms, which is consistent with the bonding pattern of a boron atom.
2. Aluminum (Al):
- Aluminum has an electron configuration of 1s^2 2s^2 2p^6 3s^2 3p^1, which allows it to form three covalent bonds.
- The Lewis structure provided matches the bonding pattern of an aluminum atom surrounded by three fluorine atoms.
To predict the molecular structure and bond angles for this ion, we can consider the following:
Molecular Structure:
The central atom E is surrounded by three fluorine atoms, forming a trigonal planar molecular structure.
Bond Angles:
In a trigonal planar molecular structure, the bond angles between the fluorine atoms and the central atom E are approximately 120 degrees.
Therefore, the possible identities for the unknown element E are boron (B) or aluminum (Al), and the predicted molecular structure is a trigonal planar arrangement with bond angles of approximately 120 degrees.
