Atom

1. Nucleus

1.1. Protons

1.2. Neutrons

1.3. Atomic Radius

2. Electron Cloud

2.1. Electrons

2.1.1. Electron Dot Diagram

2.2. Shells

2.2.1. Subshells

2.2.1.1. Orbitals

2.3. Aufbau

2.4. Hund's

2.5. Pauli Exclusion

3. Numbers

3.1. Atomic Number

3.2. Mass Number

4. Element

4.1. Periodic Table

4.1.1. Chemical Family

4.1.2. Period

5. Chemical

5.1. Diagonal Rule

6. Radioactive

6.1. Radiation

7. Isotope