Fundamentals of Atomic Structure

📋 Course Outline

1. Atomic number and charge
2. Electrons and protons balance
3. Ion formation and charge
4. Atomic mass and neutrons
5. Isotopes and molar mass
6. Energy levels and orbitals
7. Electron configurations
8. Valence electrons and shells
9. Periodic table organization

📖 1. Atomic number and charge

🔑 Key Concepts & Definitions

• Atomic number: The number of protons in an atom's nucleus. (source content)
• Charge on the nucleus: The positive charge of the nucleus, which always equals the atomic number. (source content)
• Atomic symbol: A notation combining the element's symbol with its atomic mass and atomic number, used to identify specific atoms or isotopes. (source content)

📝 Essential Points

• The atomic number equals the number of protons in the nucleus.
• The charge on the nucleus is always positive and is numerically equal to the atomic number.
• Any atom with the same atomic number is the same element, regardless of other properties.

💡 Key Takeaway

Understanding the atomic number as the count of protons and the nuclear charge clarifies the identity of an element, making it the fundamental defining feature of an atom.

📖 2. Electrons and protons balance

🔑 Key Concepts & Definitions

Neutral atom: An atom with an equal number of protons and electrons, resulting in no overall electric charge.