Statements A, B, and C relate to the nucleus and mass of the atom. The number of isotopes (A), mass number (B), and number of neutrons (C) affect the physical properties (like density, melting point, boiling point, radioactive decay) but generally do not significantly alter the chemical behavior of an element.
The chemical properties of an element depend upon
Asked in UPSC CDS 1 2017 · Topic: Atomic Structure (Electronic Configurations of Multi-electron Atoms and Ions)
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Answer: D. the number of electrons in the outermost shell of the element
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