The Periodic Table
作者：Baylee Kuschel
1. Alkali Metals
1.1. Lithium
1.2. Sodium
1.3. Potassium
1.4. Rubidium
1.5. Cesium
1.6. Francium
2. Halogens
2.1. Fluorine
2.2. Chlorine
2.3. Bromine
2.4. Iodine
2.5. Astatine
3. Noble Gases
3.1. Helium
3.2. Neon
3.3. Argon
3.4. Krypton
3.5. Xenon
3.6. Radon
4. Transitional Metals
4.1. Mercury
4.2. Rhodium
4.3. Tungsten
4.4. Zirconium
4.5. Gold
5. History
5.1. J.W. Dobereiner
5.1.1. (1829) classification system based on their chemical properties but not all elements set into triads
5.2. Dmitri Mendeleev
5.2.1. (1869) Classification system based on atomic mass
5.3. Milestones
5.3.1. 1829
5.3.1.1. Triad groups on chemical properties
5.3.2. 1869
5.3.2.1. Group by atomic massin numerial order
5.3.3. 2000
5.3.3.1. modern periodic table, elements are arranged in order of increasing atomic #
6. Periodic Law
6.1. The elements on the periodic table are arranged by atomic number and physical and chemical properties.
6.2. Ex: Alkali metals starts with Li that is not very radioactive and ends with Fr that is highly radioactive.
7. Classifcation
7.1. Metals
7.1.1. Titainium
7.2. Non-metals
7.2.1. Sulfur
7.3. Metalloids
7.3.1. Boron