Which one is true about isotope ?
Correct answer: D. Same chemical properties
- A. Same number of neutrons
- B. Same mass number
- C. Same physical properties
- D. Same chemical properties
Explanation
Isotopes have the same number of protons and, in neutral atoms, the same number and arrangement of electrons. Chemical reactions depend mainly on electron arrangement, so isotopes have the same chemical properties, although their physical and nuclear properties may differ. The likely mistake is choosing c because isotopes have some similar physical properties, but they are not identical in all physical behaviour.
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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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