Which of the following elements can form both ionic and covalent bonds ?

Options

A. Argon
B. Hydrogen
C. Iron
D. Neon

Explanation

To determine which of the following elements can form both ionic and covalent bonds, we will analyze each option provided: Argon, Hydrogen, Iron, and Neon.

### Step-by-Step Solution:

1. **Identify the Nature of Each Element:**
- **Argon (Ar)**: Argon is a noble gas with a complete octet. Noble gases are known for their stability and do not typically form bonds. Therefore, Argon cannot form either ionic or covalent bonds.
- **Hydrogen (H)**: Hydrogen is unique because it can form both ionic and covalent bonds. It can share electrons to form covalent bonds (e.g., in HCl) and can also lose an electron to form an ionic bond (e.g., in NaH).
- **Iron (Fe)**: Iron is a transition metal and can form ionic bonds (e.g., FeCl2) and coordinate bonds in complex compounds. However, it does not typically form covalent bonds in the same way that nonmetals do.
- **Neon (Ne)**: Like Argon, Neon is also a noble gas with a complete octet. It does not form bonds and therefore cannot form ionic or covalent bonds.

2. **Conclusion:**
- Among the given options, only **Hydrogen** can form both ionic and covalent bonds.

### Final Answer:
**Hydrogen (H)** is the element that can form both ionic and covalent bonds.

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