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Sep 20, 2024 · Periodic table, in chemistry, the organized array of all the chemical elements in order of increasing atomic number. When the elements are thus arranged, there is a recurring pattern called the ‘periodic law’ in their properties, in which elements in the same column (group) have similar properties.
The periodic table, also known as the periodic table of the elements, is an ordered arrangement of the chemical elements into rows ("periods") and columns ("groups"). It is an icon of chemistry and is widely used in physics and other sciences.
The elements are arranged in a periodic table, which is probably the single most important learning aid in chemistry. It summarizes huge amounts of information about the elements in a way that permits you to predict many of their properties and chemical reactions.
- Alkali Metals. The alkali metals are all elements of Group I except hydrogen. These elements have one valence electron. They are highly reactive and can burst into flames when exposed to air.
- Alkaline Earth Metals. The alkaline earth metals are located in Group 2 of the periodic table, from beryllium (Be) to radium (Ra). They have two electrons in their outermost shell and are the second most reactive after alkali metals.
- Transition Metals. The transition metals lie from Group 3 to Group 12. They have more than one oxidation state, meaning they can have many oxidation numbers.
- Post-Transition Metals. The post-transition metals are located in between transition metals and the metalloids. They span from Groups 13 to 16. They have some characteristics of transition metals but are soft and conduct more poorly than transition metals.
Oct 29, 2019 · Chart Organization. The organization of the periodic table allows you to predict the properties of the elements based on their position on the chart. Here's how it works: Elements are listed in numerical order by atomic number. The atomic number is the number of protons in an atom of that element.
- Anne Marie Helmenstine, Ph.D.
Mar 21, 2024 · Join us as we uncover the beauty and complexity of the periodic table, illuminating the patterns and principles that govern the world of atoms and molecules. In this video, we embark on a...
- 60 min
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- Jason Gibson
The modern periodic table organizes elements into a grid based on their atomic number. Both the horizontal and vertical positionings of an element within the table give clues as to that element's behavior, making the periodic table a quick and useful reference for predicting how certain elements will react with each other.
