The atomic masses of elements depend upon:
Correct answer: C. Number of isotopes & their abundance
- A. Atomic number
- B. Number of electrons
- C. Number of isotopes & their abundance
- D. None of the above
Explanation
Atomic mass depends on the number of isotopes and their abundance because:Isotopes of an element have the same atomic number but different masses due to varying numbers of neutrons.The atomic mass is an average of the masses of all isotopes weighted by their natural abundance.Variations in isotopic abundance lead to different average atomic masses for elements.
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About Periodic Properties and Trends
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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