11th Class Chemistery Elements And Atomic Number Pdf

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List of elements by atomic mass

This is a list of chemical elements , sorted by atomic mass or most stable isotope and color coded according to type of element. Each element's atomic number , name, element symbol , and group and period numbers on the periodic table are given. The number in parenthesis gives the uncertainty in the "concise notation" dis given in parenthesis next to the least significant digits to which it applies", e. For artificial elements the nucleon count of the most stable isotope is listed brackets. This wiki. This wiki All wikis. Sign In Don't have an account?

Chemistry Notes for Class 11 STRUCTURE OF ATOM Download in pdf

Thanks for visiting our website. Our aim is to help students learn subjects like physics, maths and science for students in school , college and those preparing for competitive exams. All right reserved. All material given in this website is a property of physicscatalyst. Chemical properties of the element is determined by the number of electrons in the element ,which is determined by number of protons i. Periodic table is arranged as per the atomic number of the elements. Each element has unique number of protons,So atomic number helps in identification of elements Atomic Mass Number A Atomic Mass Number is defined as the sum of number of protons and Number of neutrons in the nucleus.

Ncert Chemistry Class 11 Periodic Table Chart CLASSIFICATION OF E

Fluorine is a chemical element with the symbol F and atomic number 9. It is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. As the most electronegative element, it is extremely reactive, as it reacts with all other elements, except for argon , neon , and helium. Among the elements, fluorine ranks 24th in universal abundance and 13th in terrestrial abundance. Fluorite , the primary mineral source of fluorine which gave the element its name, was first described in ; as it was added to metal ores to lower their melting points for smelting , the Latin verb fluo meaning "flow" gave the mineral its name.

Moseley, the English physicist showed that atomic number is more fundamental property of an element than its atomic mass. Therefore, the position of an element in the periodic table depends on its atomic number than its atomic mass. M o d e r n Periodic Law : The physical and chemical properties of elements are the periodic functions of their atomic numbers. T ypes of Elements: s-, p-, d- and f- blocks.

Unit No. Unit I. Some Basic Concepts of Chemistry. Unit II. Structure of Atom.

Atom is the smallest indivisible particle of the matter. Cathode ray discharge tube experiment: A cathode ray discharge tube madeof glass is taken with two electrodes. At very low pressure and high voltage,current starts flowing through a stream of particles moving in the tube fromcathode to anode.

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