The periodic table is a tabular arrangement of chemical elements based on their atomic number, electron configuration, and recurring chemical properties. Elements are organized in rows and columns according to their properties, with elements in the same column having similar characteristics. The table is divided into groups (columns) and periods (rows) to help classify elements based on their properties and atomic structure. The periodic table allows scientists to predict the behavior of elements and their compounds, as well as discover relationships between different elements. **

There is no definitive answer to which periodic table is better as both the Mendeleev periodic table and the modern periodic table have their own strengths and weaknesses. The Mendeleev periodic table is credited with predicting the properties of undiscovered elements and organizing elements based on their atomic mass. On the other hand, the modern periodic table arranges elements based on their atomic number, which reflects the number of protons in the nucleus. Ultimately, the choice of which periodic table is better depends on the context in which it is being used and personal preference. **

The periodic table is a tabular arrangement of all known chemical elements, organized by their atomic number, electron configuration, and recurring chemical properties. It is a fundamental tool in chemistry that allows scientists to predict the behavior of elements and their compounds. The table is divided into rows called periods and columns called groups, with elements in the same group sharing similar characteristics. The periodic table is constantly updated as new elements are discovered and our understanding of chemistry evolves. **

The periodic table of elements is not called the periodic table of atoms because it is organized based on the properties of elements, not individual atoms. The table arranges elements in order of increasing atomic number and groups them based on similar chemical and physical properties. It provides a systematic way to understand the behavior and characteristics of different elements, which is not specific to individual atoms. Additionally, the periodic table represents the elements in their neutral state, rather than as individual atoms with specific numbers of protons, neutrons, and electrons. **

Metals are located on the left side of the periodic table, occupying the majority of the elements. They are characterized by their shiny appearance, high electrical and thermal conductivity, and malleability. Metals tend to lose electrons to form positive ions and are typically good conductors of electricity and heat. Some of the most well-known metals include copper, iron, gold, and silver. **

Helium is located in the top right corner of the periodic table, in the group 18 (noble gases) and period 1. It is the second lightest element and is the first of the noble gases. Helium has a full outer electron shell, making it very stable and non-reactive. **

Hydrogen is the first element in the periodic table and is placed in the top left corner. It is a nonmetal and has an atomic number of 1, which means it has one proton in its nucleus. Hydrogen is unique in that it does not fit neatly into any one group or family in the periodic table, as it has properties of both alkali metals and nonmetals. **

The periodic table is stored in various places, including textbooks, websites, and scientific journals. It is also commonly found in classrooms, laboratories, and research facilities. Additionally, the periodic table can be accessed through mobile apps and online databases for easy reference and study. **