In which type of compound does one atom borrow an electron from another atom?

The type of compound in which one atom borrows an electron from another atom is called an ionic compound. Here's the step-by-step process:

1. In an ionic compound, atoms are held together by ionic bonds, which are formed due to the attraction between oppositely charged ions.

2. These ions are formed when one atom (usually a metal) donates one or more of its electrons to another atom (usually a nonmetal). This process is known as ionization.

3. The atom that loses electrons becomes a positively charged ion (cation), and the atom that gains electrons becomes a negatively charged ion (anion).

4. The electrostatic attraction between the cation and anion forms the ionic bond, holding the atoms together in the ionic compound.

5. An example of an ionic compound is sodium chloride (NaCl). Sodium (Na) donates one electron to chlorine (Cl), forming Na+ and Cl- ions. The attraction between these ions forms the ionic bond that holds the compound together.