Periodic Table
by Ernesto Ruiz
1. Classification
1.1. You classify the elements on the periodic table but the physical/chemical properties of the elements and you group them together.
1.2. The classes are different from each other because some of the elements are noble gases, alkaline metals and etc.
2. Alkali Metals
2.1. The alkali metals are a group in the periodic table consisting of the chemical elements lithium (Li), sodium (Na) etc. The alkali metals have very similar properties: they are all shiny, soft, highly reactive metals at standard temperature and pressure and readily lose their outermost electron to form cations with charge +1
2.2. They are located on the left side of the periodic table.
2.3. Examples of Alkali Metals are Sodium and Potassium.
3. Alkaline Earth Metals
3.1. The alkaline earth metals are a group of chemical elements in the periodic table with very similar properties. They are all shiny, silvery-white, somewhat reactive metals at standard temperature and pressure and readily lose their two outermost electrons to form cations with charge 2+
3.2. They are located right next to the Alkali Metals.
3.3. Some example of Alkaline Earth Metals are Magnesium and Calcium.
4. Halogens
4.1. The Halogens are a group in the periodic table consisting of five chemically related elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).
4.2. In row 17 of the periodic table.
4.3. Examples of Halogens are Bromine and Chlorine.
5. Noble Gases
5.1. The noble gases make a group of chemical elements with similar properties: under standard conditions, they are all odorless, colorless, monatomic gases with very low chemical reactivity.
5.2. They are in the last row on the periodic table
5.3. Example of a Noble gas is Neon.
6. Transitional Metals
6.1. Transitional Metals are the Group B elements that are usually displayed in the main body of a periodic table.
6.2. It is in the middle of the periodic table
6.3. Examples GOLD
7. Inner Transitional Metals
7.1. Inner transitional metals are rare-earth metals.
7.2. The inner transition metals are the elements that appear below the main body of the periodic table.
7.3. Example of inner transition metal is Thorium
8. History
8.1. Milestones
8.1.1. 1.Classification System
8.1.1.1. 2.Table of Elements
8.1.1.1.1. 3.Order for Elements
8.2. Scientists
8.2.1. J.W. Dobereiner
8.2.1.1. In 1829, German chemist, J.W. Dobereiner published a classification system. In his system, then known elements were grouped into triads. Triads were set of three elements with similar properties
8.2.2. Dmitri Mendeleev
8.2.2.1. In 1869, Russian chemist/teacher, Dmitri Mendeleev, published a table of the elements. He found the relationships between 60 elements so the elements in a periodic table are arranged into groups based on a set repeating properties.