The correct option is **B. Ionic bond**. ### Explanation of the Correct Answer An **ionic bond** is formed when electrons are transferred from one atom to another. This process leads to the formation of charged ions. Here’s a step-by-step breakdown of how this occurs: 1. **Electron Transfer**: In an ionic bond, one atom (usually a metal) loses one or more electrons, becoming a positively charged ion (cation). The other atom (usually a non-metal) gains those electrons, becoming a negatively charged ion (anion). For example, in the formation of sodium chloride (NaCl), sodium (Na) loses one electron to become Na⁺, while chlorine (Cl) gains that electron to become Cl⁻. 2. **Formation of Ions**: The loss and gain of electrons create ions. The cation and anion are now charged particles. The electrostatic attraction between these oppositely charged ions is what constitutes the ionic bond. 3. **Lattice Structure**: Ionic compounds typically form a crystalline lattice structure, where each cation is surrounded by anions and vice versa. This arrangement maximizes the attractive forces between the oppositely charged ions, leading to a stable structure. ### Why the Other Options are Incorrect - **A. Covalent bond**: In a covalent bond, electrons are shared between atoms rather than transferred. This type of bond typically occurs between non-metal atoms. For example, in a water molecule (H₂O), the oxygen atom shares electrons with two hydrogen atoms. Since there is no transfer of electrons, this option is incorrect. - **C. Metallic bond**: Metallic bonds involve a 'sea of electrons' that are delocalized over a lattice of metal cations. In this type of bond, electrons are not transferred to form ions; instead, they are shared among many atoms, allowing metals to conduct electricity and heat. Therefore, this option does not fit the description of electron transfer leading to ion formation. - **D. Hydrogen bond**: A hydrogen bond is a weak attraction that occurs between a hydrogen atom covalently bonded to a highly electronegative atom (like oxygen or nitrogen) and another electronegative atom. This type of bond does not involve the transfer of electrons or the formation of ions, making it irrelevant to the question. ### Summary of Key Points - An **ionic bond** is formed through the transfer of electrons, resulting in the creation of cations and anions. - The electrostatic attraction between these oppositely charged ions leads to the formation of a stable ionic compound. - Other types of bonds (covalent, metallic, hydrogen) do not involve electron transfer and thus do not result in the formation of charged ions. ### Revision Summary - Ionic bonds involve electron transfer, forming charged ions (cations and anions). - Cations are positively charged ions formed by electron loss, while anions are negatively charged ions formed by electron gain. - Ionic compounds typically form crystalline structures due to the strong electrostatic forces between ions. - Other bond types (covalent, metallic, hydrogen) do not involve the transfer of electrons and are therefore not ionic bonds.