Atoms and Nuclei

Short Definition

Atoms are the smallest units of matter that retain chemical properties. Nuclei are the central core of atoms containing protons and neutrons.

Detailed Explanation

Atoms consist of a nucleus surrounded by electrons. The nucleus contains protons and neutrons, which account for most of the mass. Nuclear reactions, such as fission and fusion, release large amounts of energy. This chapter explains atomic models, radioactivity, and nuclear energy.

Key Concepts

• Atomic structure: Electrons, protons, neutrons
• Atomic models: Rutherford, Bohr
• Radioactivity: Alpha, beta, gamma decay
• Nuclear reactions: Fission and Fusion
• Half-life and radioactive decay calculations

Importance

Understanding atoms and nuclei is essential for nuclear energy, radiation applications, medical imaging, and modern physics.