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History of Periodic Table - Elements & Periodicity Video Lecture - Class 11
FAQs on History of Periodic Table - Elements & Periodicity Video Lecture - Class 11
| 1. What is the history of the periodic table? |  |
Ans. The periodic table is a tabular arrangement of chemical elements, organized based on their atomic number, electron configuration, and recurring chemical properties. It was first proposed by Dmitri Mendeleev in 1869. Mendeleev's periodic table arranged elements in order of increasing atomic weight and grouped them based on similar properties. Over time, the periodic table has gone through several modifications and improvements to reflect the discovery of new elements and advancements in atomic theory.
| 2. How are elements arranged in the periodic table? | |
Ans. Elements in the periodic table are arranged in order of increasing atomic number, which represents the number of protons in an atom's nucleus. The table consists of rows called periods and columns called groups. Elements in the same period have the same number of electron shells, while elements in the same group have similar chemical properties due to having the same number of valence electrons.
| 3. What is the significance of the periodic table? | |
Ans. The periodic table is of immense significance in the field of chemistry. It allows scientists to organize and classify elements based on their properties, which helps in understanding and predicting their reactivity, behavior, and chemical reactions. The periodic table also provides a systematic way to identify and study the relationships between different elements, facilitating the development of various chemical theories and principles.
| 4. How has the periodic table evolved over time? | |
Ans. The periodic table has evolved significantly since its inception. Initially, Mendeleev's periodic table arranged elements based on their atomic weight and properties. However, the discovery of isotopes and advancements in atomic theory led to the modification of the table to reflect the elements' atomic number instead. The modern periodic table also incorporates the concepts of electron configuration and quantum mechanics, providing a more accurate representation of the elements and their properties.
| 5. How many elements are currently in the periodic table? | |
Ans. As of now, the periodic table consists of 118 confirmed elements. These elements range from hydrogen (atomic number 1) to oganesson (atomic number 118). However, elements beyond atomic number 118 have been synthesized in laboratories, but their stability and properties are still being studied.
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Nov 13, 2024 Last updated |
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