Isotopes differ in_________________?
Correct answer: A. properties which depend upon mass
- A. properties which depend upon mass
- B. arrangement of electrons in orbitals
- C. chemical properties
- D. all of the above
Explanation
Isotopes have the same atomic number and therefore the same electron arrangement in neutral atoms, giving them almost identical chemical properties. Their different numbers of neutrons give different masses and mass-dependent physical properties. The likely mistake is choosing d by treating the mass difference as large enough to change ordinary chemical behaviour.
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About Electronic Configuration
Electronic configuration describes how electrons occupy shells, subshells and orbitals around an atom. Questions use the Aufbau principle, Pauli exclusion principle and Hund's rule to write configurations, identify valence electrons, form ions and explain periodic trends, including common exceptions such as chromium and copper.
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