* Atoms are normally neutral: Atoms have a balanced number of protons (positively charged) and electrons (negatively charged). This balance results in a neutral overall charge.
* Gaining electrons: When an atom gains electrons, it has more negative charges than positive charges. This imbalance results in a net negative charge.
* Example: A chlorine atom (Cl) has 17 protons and 17 electrons. If it gains one electron, it becomes a chloride ion (Cl-) with 17 protons and 18 electrons, resulting in a net negative charge.
Why is this important?
* Chemical bonding: Atoms often gain or lose electrons to achieve a stable configuration. This process forms chemical bonds and is the basis of chemical reactions.
* Electrical conductivity: Materials with a net gain of electrons can conduct electricity. This is because the extra electrons are loosely bound and can move freely, carrying an electrical current.
* Ionic compounds: When atoms gain or lose electrons, they become ions. These ions can then interact with each other through electrostatic forces, forming ionic compounds.
Key takeaways:
* A net gain of electrons results in a negative charge.
* This phenomenon is crucial for understanding chemical bonding, electrical conductivity, and the formation of ionic compounds.
