Atom

1. aka Atomic Mass Number

2. Mass Number

2.1. Protons + Neutrons

3. Nucleus

3.1. Protons

3.2. Neutrons

4. Electron Cloud

4.1. Valence Electrons

4.2. 3 Main energy Levels

5. Electrons

5.1. Subshells

5.1.1. Orbitals: s,p,d,f

5.1.2. Diagonal Rule

5.2. Afbau Principle

5.3. Hund's Rule

5.4. Electron Configuration

6. Electron Dot Diagram

7. Radioactive

7.1. Radiation

7.2. Nuclear Decay

7.3. Beta Decay

7.4. Gama decay

8. Small

8.1. Basic unit of a Chemical Element

9. Atomic Number

9.1. Number of Protons

9.2. On every element

10. Element

10.1. species of atoms having the same number of protons in their atomic nuclei

10.2. Periodic Table

10.2.1. Chemical Family

11. Isotopes

11.1. Ions

12. Atomic Radius

12.1. Distance from Nucleus