Which are correct statements for Be and Al ?

Options

A. Both are rendered passive by conc. `HNO_(3)`
B. Both have sp-hybridization in their compounds
C. Both form amphoteric oxides
D. Both form ionic hydrides

Explanation

To determine the correct statements for Beryllium (Be) and Aluminium (Al), we can analyze their properties and relationships based on their positions in the periodic table.

### Step-by-Step Solution:

1. **Identify the Position in the Periodic Table:**
- Beryllium (Be) is located in Group 2 (alkaline earth metals) and Period 2 of the periodic table.
- Aluminium (Al) is located in Group 13 (p-block element) and Period 3.

2. **Understand the Diagonal Relationship:**
- Beryllium and Aluminium exhibit a diagonal relationship due to their similar properties. This relationship arises from their comparable electronegativities and ionic radii.
- The diagonal relationship suggests that elements in adjacent groups and periods can have similar chemical properties.

3. **Compare Electronegativity:**
- Beryllium has a relatively high electronegativity compared to other alkaline earth metals, while Aluminium also has a significant electronegativity in its group.
- This similarity in electronegativity contributes to their comparable behavior in chemical reactions.

4. **Polarizing Power:**
- Beryllium has a high polarizing power due to its small size and high charge density, which allows it to polarize anions effectively.
- Aluminium, being larger than Beryllium, has lower polarizing power but still exhibits some degree of it due to its charge.

5. **Chemical Behavior:**
- Both Be and Al form covalent compounds due to their ability to polarize anions.
- They can also form oxides and hydroxides, but Beryllium oxide (BeO) is more covalent compared to Aluminium oxide (Al2O3).

6. **Conclusion:**
- Correct statements about Beryllium and Aluminium include:
- They both exhibit a diagonal relationship in the periodic table.
- They have similar electronegativities and polarizing powers.
- They can form covalent compounds and exhibit similar chemical behaviors.