Atom

An atom is the fundamental building block of matter. It consists of:

• Nucleus: The central part of the atom, which contains:
• Protons: Positively charged particles.
• Neutrons: Neutral particles with no charge.
• Electrons: Negatively charged particles that orbit the nucleus in various energy levels or shells.

The arrangement and number of protons, neutrons, and electrons determine the chemical properties and identity of the atom.