InterviewSolution
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InterviewSolution
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Tkl s m गातन o o Je |
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Answer» The valence or valency of an element is a measure of its combining power with other atoms when it forms chemical compounds or molecules. The concept of valence developed in the second half of the 19th century and helped successfully explain the molecular structure of inorganic and organic compounds Theatomic number (represented by the letter Z)of an element is the number of protons in the nucleus of each atom of that element.Themass number (represented by the letter A)is defined as the total number of protons and neutrons in an atom Each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element. Each of two or more isotopes of different elements, with the same atomic weight |
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