Question
Which sentence describing different types of bonding is correct? Covalent bonding occurs when positive ions are held together by delocalised outer electrons. When an atom gains one or more electrons it forms a negative ion. When two ions are attracted to one another they form a covalent bond. In ionic bond is formed when two atoms share a pair of electrons. 1 point
Answer
4.2
(236 Votes)
Eliza
Expert · Tutor for 3 years
Answer
The correct statement is: "When an atom gains one or more electrons it forms a negative ion."
Explanation
## Step 1: First, we need to understand the basic definitions of the three types of bonding: covalent, ionic, and metallic. ### Covalent bonding occurs when two atoms share a pair of electrons. ### Ionic bonding happens when an atom loses or gains one or more electrons, forming positive or negative ions, respectively. These ions are then attracted to each other due to their opposite charges.### Metallic bonding involves positive ions held together by a "sea" of delocalised outer electrons.## Step 2: Next, we compare these definitions with the statements given in the question.### The first statement is incorrect because it describes metallic bonding, not covalent bonding.### The second statement is correct as it describes the formation of a negative ion, which is a part of ionic bonding.### The third statement is incorrect because the attraction between two ions forms an ionic bond, not a covalent bond.### The fourth statement is incorrect because it describes covalent bonding, not ionic bonding.